Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code for reference

Bug: 161896447
Test: robotest & manual
Change-Id: I890335a0c0e31f7d3ea32c6130482e4ef0e20b88

src/com/android/settings/location/LocationEnabler.java

@@ -109,7 +109,7 @@ public class LocationEnabler implements LifecycleObserver, OnStart, OnStop {
 
         if (isRestricted()) {
             // Location toggling disabled by user restriction. Read the current location mode to
-            // update the location master switch.
+            // update the location primary switch.
             if (Log.isLoggable(TAG, Log.INFO)) {
                 Log.i(TAG, "Restricted user, not setting location mode");
             }