tools/BUILD: Make AssertEqualsArgumentOrder a warning

I don't know why this check kicked in now, but it is reporting errors
in many tests.

Reduce to warning (order of the expected/actual is not SO
dramatic). We can fix the code and upgrade to error in following changes.

Change-Id: I00ad9cac6c05494a662a8848813479a931f16caf

tools/BUILD

diff --git a/tools/BUILD b/tools/BUILD
index 844f004..379a9bd 100644
--- a/tools/BUILD
+++ b/tools/BUILD
@@ -54,7 +54,7 @@
         "-Xep:ArrayHashCode:ERROR",
         "-Xep:ArraysAsListPrimitiveArray:ERROR",
         "-Xep:ArrayToString:ERROR",
-        "-Xep:AssertEqualsArgumentOrderChecker:ERROR",
+        "-Xep:AssertEqualsArgumentOrderChecker:WARN",
         "-Xep:AssertionFailureIgnored:WARN",
         "-Xep:AsyncCallableReturnsNull:ERROR",
         "-Xep:AsyncFunctionReturnsNull:ERROR",