Fix variant usage

Replace variant.get with ::get<type>(variant)

Change-Id: I42e690e0da4a17afe7cc9c3d0835bbf530abbe58
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/src/sensorcommands.cpp b/src/sensorcommands.cpp
index 6456ca1..849f678 100644
--- a/src/sensorcommands.cpp
+++ b/src/sensorcommands.cpp
@@ -708,11 +708,13 @@
 
             if (warningHigh != warningMap.end())
             {
-                warningHighAlarm = warningHigh->second.get<bool>();
+                warningHighAlarm = sdbusplus::message::variant_ns::get<bool>(
+                    warningHigh->second);
             }
             if (warningLow != warningMap.end())
             {
-                warningLowAlarm = warningLow->second.get<bool>();
+                warningLowAlarm = sdbusplus::message::variant_ns::get<bool>(
+                    warningLow->second);
             }
             if (warningHighAlarm)
             {
@@ -735,11 +737,13 @@
 
             if (criticalHigh != criticalMap.end())
             {
-                criticalHighAlarm = criticalHigh->second.get<bool>();
+                criticalHighAlarm = sdbusplus::message::variant_ns::get<bool>(
+                    criticalHigh->second);
             }
             if (criticalLow != criticalMap.end())
             {
-                criticalLowAlarm = criticalLow->second.get<bool>();
+                criticalLowAlarm = sdbusplus::message::variant_ns::get<bool>(
+                    criticalLow->second);
             }
             if (criticalHighAlarm)
             {