Fix for overflow items into menu not showing because of color (#8243)

Author: markdevocht

android/src/main/java/com/reactnativenavigation/views/stack/topbar/titlebar/ButtonBar.kt

@@ -11,6 +11,7 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.appcompat.widget.ActionMenuView
 import androidx.appcompat.widget.Toolbar
+import com.reactnativenavigation.R
 import com.reactnativenavigation.utils.ObjectUtils
 import com.reactnativenavigation.utils.ViewUtils
 import com.reactnativenavigation.viewcontrollers.stack.topbar.button.ButtonController
@@ -21,6 +22,7 @@ open class ButtonBar internal constructor(context: Context) : Toolbar(context) {
     init {
         super.setContentInsetsAbsolute(0, 0)
         this.contentInsetStartWithNavigation = 0
+        setPopupTheme(R.style.TopBarOverflowPopup)
     }
 
     override fun onViewAdded(child: View) {

android/src/main/res/values/styles.xml

@@ -4,6 +4,8 @@
         <item name="elevation">0dp</item>
     </style>
 
+    <style name="TopBarOverflowPopup" parent="ThemeOverlay.AppCompat.Light" />
+
     <!--The following is a workaround needed to run unit tests in command line-->
     <style name="Widget.Support.CoordinatorLayout" parent="android:Widget">
         @null