Removed buildToolsVersion from build.gradle in another probably futile attempt to fix gradle errors.

products/android/Monkey2Game/app/build.gradle

@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 24
-    buildToolsVersion "26.0.2"
 
     defaultConfig {
         applicationId "${PACKAGE_NAME}"