Update summary for "Voice Calls"

Change it from "Screen usage 2m" to "2m", since this is not a screen
usage. This cl has effect on all non-app batterySipper.

Bug: 63443732
Test: RunSettingsRoboTests
Change-Id: I027b3234bd7b56738ab31c5dfbc0d8bd7f19186e

src/com/android/settings/fuelgauge/PowerUsageSummary.java

@@ -710,8 +710,11 @@ public class PowerUsageSummary extends PowerUsageBase implements
         if (usageTimeMs >= DateUtils.MINUTE_IN_MILLIS) {
             final CharSequence timeSequence = Utils.formatElapsedTime(getContext(), usageTimeMs,
                     false);
-            preference.setSummary(mBatteryUtils.shouldHideSipper(sipper) ? timeSequence :
-                    TextUtils.expandTemplate(getText(R.string.battery_screen_usage), timeSequence));
+            preference.setSummary(
+                    (sipper.drainType != DrainType.APP || mBatteryUtils.shouldHideSipper(sipper))
+                            ? timeSequence
+                            : TextUtils.expandTemplate(getText(R.string.battery_screen_usage),
+                                    timeSequence));
         }
     }