Promote ExtraText lint warning to an error

It was previously demoted due to preexisting occurances
of it in the tree, but those have all been removed now.

Bug: 236431222
Test: m lint-check
Change-Id: Ic3501c43a09b10bc8a2944b0caa6ebbec663a008
diff --git a/java/lint_defaults.txt b/java/lint_defaults.txt
index e99cb05..01e7e6e 100644
--- a/java/lint_defaults.txt
+++ b/java/lint_defaults.txt
@@ -101,7 +101,6 @@
 --warning_check WrongViewCast                      # 1 occurences in 1 modules
 
 --warning_check CoarseFineLocation
---warning_check ExtraText
 --warning_check IntentFilterExportedReceiver
 --warning_check MissingInflatedId
 --warning_check NotificationPermission