Increasing char limit for string, per localization request.

Bug: 123638453
Change-Id: I40aea84f88cb91e4cd123fa0181894867c0e02f7
Tests: none
diff --git a/quickstep/res/values/strings.xml b/quickstep/res/values/strings.xml
index 0c741a1..753ad0c 100644
--- a/quickstep/res/values/strings.xml
+++ b/quickstep/res/values/strings.xml
@@ -52,7 +52,7 @@
     <string name="task_contents_description_with_remaining_time"><xliff:g id="task_description" example="GMail">%1$s</xliff:g>, <xliff:g id="remaining_time" example="7 minutes left today">%2$s</xliff:g></string>
 
     <!-- Text to show total app usage per day if it is less than 1 minute ("&lt;" is the
-     escaped form of '<'). [CHAR LIMIT=10] -->
+     escaped form of '<'). [CHAR LIMIT=15] -->
     <string name="shorter_duration_less_than_one_minute">&lt; 1 minute</string>
 
     <!-- Annotation shown on an app card in Recents, telling that the app was switched to a