cleanup: remove trailing spaces from app/build.gradle

[brody4hire]

(in the template)

Platforms affected

Android

Motivation and Context

Discovered while working on Gradle update in PR #988

Note that git grep -c ' $' shows trailing spaces in a number of other files. I discovered something similar in cordova-ios, would like to go through the other repos if I get a chance someday.

Description

remove trailing spaces from bin/templates/project/app/build.gradle

Testing

• npm test
• tested with cordova-sqlite-storage test app

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

Merging #990 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #990   +/-   ##
=======================================
  Coverage   68.11%   68.11%           
=======================================
  Files          21       21           
  Lines        1866     1866           
=======================================
  Hits         1271     1271           
  Misses        595      595           

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