Enable the color lint check

We disabled color check because the error message was
ambiguous when the android environment hadn't been set
up.

Since the error mesage has been updated, we can turn it
back on.

Bug: 65850237
Test: repo upload .
Change-Id: I9517192b8b7d8131014e3ac44e3edb2d97134bb6
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index bbc1f68..62a2e43 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -1,4 +1,5 @@
 [Hook Scripts]
 checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --sha ${PREUPLOAD_COMMIT}
                   -fw src/com/android/settings/print/
+checkcolor_hook = ${REPO_ROOT}/prebuilts/checkcolor/checkcolor.py -p .