Launcher3: Fix TaskbarViewCallbacksFactory instantiation

Overrides.getObject() calls the constructor with context if the overlay
has a valid class, if empty it uses the constructor without args.
Considering this class is part of quickstep, we should support both
cases, since this is the fallback class anyway

Based on 93f44a4

Change-Id: Ida3f5e056522871dc35ce48a5488ad28b6b0c2cc
Signed-off-by: Adithya R <gh0strider.2k18.reborn@gmail.com>

quickstep/src/com/android/launcher3/taskbar/TaskbarViewCallbacksFactory.kt

@@ -22,7 +22,10 @@ import com.android.launcher3.util.ResourceBasedOverride
 import com.android.launcher3.util.ResourceBasedOverride.Overrides
 
 /** Creates [TaskbarViewCallbacks] instances. */
-open class TaskbarViewCallbacksFactory : ResourceBasedOverride {
+// We must have constructors with and without context for Overrides.getObject
+open class TaskbarViewCallbacksFactory @JvmOverloads constructor(
+    context: Context? = null
+) : ResourceBasedOverride {
 
     open fun create(
         activity: TaskbarActivityContext,