Update foreground string in battery page

Change foreground app title to "While in active use"

Bug: 36781909
Test: Build
Change-Id: Ideadc5f6efafe22b014380a5c023e4e5e6a47df5
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 3173e85..4c72e74 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -4685,7 +4685,7 @@
     <!-- Description for text in battery footer. [CHAR LIMIT=120] -->
     <string name="battery_footer_summary">Remaining battery time is approximate and can change based on usage</string>
     <!-- Title for battery usage detail in foreground. [CHAR LIMIT=80] -->
-    <string name="battery_detail_foreground">While using app</string>
+    <string name="battery_detail_foreground">While in active use</string>
     <!-- Title for battery usage detail in background. [CHAR LIMIT=80] -->
     <string name="battery_detail_background">While in background</string>
     <!-- Title for battery usage amount by this app. [CHAR LIMIT=80] -->