Minor: remove repositories blocks from subprojects of databinding test

Repositories are set in top-level build.gradle file

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kapt2/android-databinding/app/build.gradle

@@ -24,10 +24,6 @@ android {
     }
 }
 
-repositories {
-    maven { url 'https://maven.google.com' }
-}
-
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kapt2/android-databinding/library/build.gradle

@@ -34,8 +34,4 @@ dependencies {
     androidTestImplementation "com.android.support.test:rules:1.0.2"
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-contrib:3.0.2'
-}
-
-repositories {
-    mavenCentral()
 }