API Utils: Remove date-time headers

These are not needed due to:
https://github.com/openbmc/phosphor-webui/commit/dd9d4c32992568d0b634df10a0eeaf7fcd06d3dd

Change-Id: Ic58569c774bc2524089e74fb108fb764df89c4e7
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/app/common/services/api-utils.js b/app/common/services/api-utils.js
index 9aecab8..759d12c 100644
--- a/app/common/services/api-utils.js
+++ b/app/common/services/api-utils.js
@@ -1214,10 +1214,6 @@
                    method: 'GET',
                    url: DataService.getHost() +
                        '/xyz/openbmc_project/network/eth0/attr/NTPServers',
-                   headers: {
-                     'Accept': 'application/json',
-                     'Content-Type': 'application/json'
-                   },
                    withCredentials: true
                  })
               .then(function(response) {
@@ -1229,10 +1225,6 @@
                    method: 'PUT',
                    url: DataService.getHost() +
                        '/xyz/openbmc_project/network/eth0/attr/NTPServers',
-                   headers: {
-                     'Accept': 'application/json',
-                     'Content-Type': 'application/json'
-                   },
                    withCredentials: true,
                    data: JSON.stringify({'data': ntpServers})
                  })
@@ -1245,10 +1237,6 @@
                    method: 'PUT',
                    url: DataService.getHost() +
                        '/xyz/openbmc_project/time/sync_method/attr/TimeSyncMethod',
-                   headers: {
-                     'Accept': 'application/json',
-                     'Content-Type': 'application/json'
-                   },
                    withCredentials: true,
                    data: JSON.stringify({'data': timeMode})
                  })
@@ -1261,10 +1249,6 @@
                    method: 'PUT',
                    url: DataService.getHost() +
                        '/xyz/openbmc_project/time/owner/attr/TimeOwner',
-                   headers: {
-                     'Accept': 'application/json',
-                     'Content-Type': 'application/json'
-                   },
                    withCredentials: true,
                    data: JSON.stringify({'data': timeOwner})
                  })
@@ -1277,10 +1261,6 @@
                    method: 'PUT',
                    url: DataService.getHost() +
                        '/xyz/openbmc_project/time/bmc/attr/Elapsed',
-                   headers: {
-                     'Accept': 'application/json',
-                     'Content-Type': 'application/json'
-                   },
                    withCredentials: true,
                    data: JSON.stringify({'data': time})
                  })
@@ -1293,10 +1273,6 @@
                    method: 'PUT',
                    url: DataService.getHost() +
                        '/xyz/openbmc_project/time/host/attr/Elapsed',
-                   headers: {
-                     'Accept': 'application/json',
-                     'Content-Type': 'application/json'
-                   },
                    withCredentials: true,
                    data: JSON.stringify({'data': time})
                  })