Standardize to more kt-compatible syntax

The groovy file syntax was very inconsistent, and as we are moving toward
being able to configure gradle with kotlin instead of groovy, the kt-compatible
syntax is preferred by the build team.

Change-Id: I8692107f9095a5725364318ff6628101686389f1

diff --git a/placeholder-tests/build.gradle b/placeholder-tests/build.gradle
index f0ba3cc..863ce958 100644
--- a/placeholder-tests/build.gradle
+++ b/placeholder-tests/build.gradle

@@ -31,4 +31,4 @@
 
 androidx {
     name = "Dummy Project for test runner"
-}
\ No newline at end of file
+}