Fix module filtering when include filters exists

When module (-m) is provided and include filters exist
make sure the list is properly repopulated.

Bug: 31370651
Change-Id: I5629d373e9d0a9dc5b11db3d2e6ae85093965ff6
diff --git a/common/host-side/tradefed/src/com/android/compatibility/common/tradefed/testtype/CompatibilityTest.java b/common/host-side/tradefed/src/com/android/compatibility/common/tradefed/testtype/CompatibilityTest.java
index 3e99186..85584d7 100644
--- a/common/host-side/tradefed/src/com/android/compatibility/common/tradefed/testtype/CompatibilityTest.java
+++ b/common/host-side/tradefed/src/com/android/compatibility/common/tradefed/testtype/CompatibilityTest.java
@@ -650,7 +650,8 @@
                 cleanedFilters.add(filter); // Module name matches, filter passes
             }
         }
-        filters = cleanedFilters;
+        filters.clear();
+        filters.addAll(cleanedFilters);
     }
 
     /**