Git ignore Android test XML output

Other rules were redundant

tests/react-test-app/.gitignore

@@ -1,34 +1 @@
-# OSX
+/tests.xml
-#
-.DS_Store
-
-# Xcode
-#
-build/
-*.pbxuser
-!default.pbxuser
-*.mode1v3
-!default.mode1v3
-*.mode2v3
-!default.mode2v3
-*.perspectivev3
-!default.perspectivev3
-xcuserdata
-*.xccheckout
-*.moved-aside
-DerivedData
-*.hmap
-*.ipa
-*.xcuserstate
-project.xcworkspace
-
-# Android/IJ
-#
-.idea
-.gradle
-local.properties
-
-# node.js
-#
-node_modules/
-npm-debug.log