Don't always use verbose output when running on bazel.

Author: Jeff Verkoeyen

bazel.sh

@@ -76,9 +76,6 @@ set -- "${POSITIONAL[@]}" # restore positional parameters
 if [ -n "$KOKORO_BUILD_NUMBER" ]; then
   # Move into our cloned repo
   cd github/repo
-
-  # Always enable verbose output on kokoro runs.
-  VERBOSE_OUTPUT=1
 fi
 
 if [ -n "$VERBOSE_OUTPUT" ]; then