Make build.gradle files even more kotlin script friendly.

Test: ./gradlew tasks
Change-Id: Ia6f61f61fef1733e990b95cdfde26a95d9091ab5
diff --git a/samples/SupportTransitionDemos/build.gradle b/samples/SupportTransitionDemos/build.gradle
index 8719221..47c84ad 100644
--- a/samples/SupportTransitionDemos/build.gradle
+++ b/samples/SupportTransitionDemos/build.gradle
@@ -1,8 +1,8 @@
 apply plugin: 'com.android.application'
 
 dependencies {
-    implementation project(':transition')
-    implementation project(':appcompat-v7')
+    implementation(project(":transition"))
+    implementation(project(":appcompat-v7"))
 }
 
 android {