Fix issue on IE cannot open SOL page

The root cause is that TextEncoder/TextDecoder does not support IE
More detail at https://caniuse.com/#feat=textencoder

One workable solution is to include text-encoder lib,
as this patch did.

Tested:
IE visit BMC and navigate to "#/server-control/remote-console"
SOL page is working well.

Change-Id: I5019c626afcf67916252db4115af7616c7a9759b
Signed-off-by: Kuiying Wang <kuiying.wang@intel.com>
diff --git a/package-lock.json b/package-lock.json
index 65e97ed..415818a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8996,6 +8996,11 @@
         }
       }
     },
+    "text-encoding": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/text-encoding/-/text-encoding-0.7.0.tgz",
+      "integrity": "sha512-oJQ3f1hrOnbRLOcwKz0Liq2IcrvDeZRHXhd9RgLrsT+DjWY/nty1Hi7v3dtkaEYbPYe0mUoOfzRrMwfXXwgPUA=="
+    },
     "through": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",