Follow up change to GridBackupTable per V2 backup / restore (multi-db)

Removed the code to handle table copying across dbs. We don't really need this since per ag/10298497, we can just copy db files directly.

Bug: 149236106
Test: N/A
Change-Id: I90bd7b6779fcaa841c71f5d0f27ec91907f926fc

src/com/android/launcher3/model/GridSizeMigrationTask.java

@@ -909,7 +909,7 @@ public class GridSizeMigrationTask {
             boolean dbChanged = false;
 
             GridBackupTable backupTable = new GridBackupTable(context, transaction.getDb(),
-                    transaction.getDb(), srcHotseatCount, sourceSize.x, sourceSize.y);
+                    srcHotseatCount, sourceSize.x, sourceSize.y);
             if (backupTable.backupOrRestoreAsNeeded()) {
                 dbChanged = true;
                 srcHotseatCount = backupTable.getRestoreHotseatAndGridSize(sourceSize);