Errorprone: Increase warning limit

We're using ErrorsAsWarnings, so all logging is as warnings. So
increase the warning limit to the soong-default error limit.

Bug: 72076216
Test: m javac-check RUN_ERROR_PRONE=true
Change-Id: I6eba22e10caccd0b0d9d7b14a814c8b199760cca
1 file changed