Update Battery Defender tips title

Bug: 175662315
Test: make SettingsRoboTests
Change-Id: I13ba773ea4402c5ae54260a8b8cbea4620eed535
diff --git a/res/values/strings.xml b/res/values/strings.xml
index c1c6a92..8bc30d8 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -5654,7 +5654,7 @@
     <!-- Summary for the battery high usage tip, which presents battery may run out earlier [CHAR LIMIT=NONE] -->
     <string name="battery_tip_high_usage_summary">Battery may run out earlier than usual</string>
     <!-- Title for the battery limited temporarily tip [CHAR LIMIT=NONE] -->
-    <string name="battery_tip_limited_temporarily_title">Preserving battery health</string>
+    <string name="battery_tip_limited_temporarily_title">Optimizing for battery health</string>
     <!-- Summary for the battery limited temporarily tip [CHAR LIMIT=NONE] -->
     <string name="battery_tip_limited_temporarily_summary">Battery limited temporarily. Tap to learn more.</string>
     <!-- Message for battery tip dialog to show the status about the battery [CHAR LIMIT=NONE] -->