Gallery2: Fix CollectionIncompatibleType

Fix incorrect indexOf lookup.

Bug: 73288226
Test: m javac-check RUN_ERROR_PRONE=true
Change-Id: Ifb158d6f4c5f0eb078f9d4fb37c7da03c2c0a4fe
diff --git a/src/com/android/gallery3d/filtershow/filters/FilterGradRepresentation.java b/src/com/android/gallery3d/filtershow/filters/FilterGradRepresentation.java
index 3459a87..34d8c94 100644
--- a/src/com/android/gallery3d/filtershow/filters/FilterGradRepresentation.java
+++ b/src/com/android/gallery3d/filtershow/filters/FilterGradRepresentation.java
@@ -104,7 +104,7 @@
                 count++;
             }
         }
-        return "c=" + mBands.indexOf(mBands) + "[" + mBands.size() + "]" + count;
+        return "c=" + mBands.indexOf(mCurrentBand) + "[" + mBands.size() + "]" + count;
     }
 
     private void creatExample() {