Add appropriate (tiny) offset to widget drops so they land correctly.

Also removed some unused parameters I found on the way.

Bug: 25191623
Change-Id: Ib9a30db106467c114cc8b54a5b13ed3e88162d56
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index a379acc..9532c39 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -900,8 +900,7 @@
     }
 
     @Thunk void completeTwoStageWidgetDrop(final int resultCode, final int appWidgetId) {
-        CellLayout cellLayout =
-                (CellLayout) mWorkspace.getScreenWithId(mPendingAddInfo.screenId);
+        CellLayout cellLayout = mWorkspace.getScreenWithId(mPendingAddInfo.screenId);
         Runnable onCompleteRunnable = null;
         int animationType = 0;