Search for textual buttons only in ActionMenuView instead of the entire ToolBar

This prevents a rare bug where the title would be styled as a button if both contained the same text

lib/android/app/src/main/java/com/reactnativenavigation/utils/ButtonOptionsPresenter.java

 import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
 import android.support.annotation.NonNull;
+import android.support.v7.widget.ActionMenuView;
 import android.support.v7.widget.Toolbar;
 import android.text.Spannable;
 import android.text.SpannableString;
 
 public class ButtonOptionsPresenter {
     private final Toolbar toolbar;
+    private final ActionMenuView actionMenuView;
     private Button button;
 
     public ButtonOptionsPresenter(Toolbar toolbar, Button button) {
         this.toolbar = toolbar;
+        actionMenuView = ViewUtils.findChildrenByClass(toolbar, ActionMenuView.class).get(0);
         this.button = button;
     }
 
     private ArrayList<View> findActualTextViewInMenu() {
         ArrayList<View> outViews = new ArrayList<>();
         if (button.text.hasValue()) {
-            toolbar.findViewsWithText(outViews, button.text.get(), View.FIND_VIEWS_WITH_TEXT);
+            actionMenuView.findViewsWithText(outViews, button.text.get(), View.FIND_VIEWS_WITH_TEXT);
         }
         return outViews;
     }

lib/android/app/src/main/java/com/reactnativenavigation/utils/ViewUtils.java

         return ret;
     }
 
-    public static <T> List<T> findChildrenByClass(ViewGroup root, Class clazz) {
+    public static <T> List<T> findChildrenByClass(ViewGroup root, Class<T> clazz) {
         return findChildrenByClass(root, clazz, child -> true);
     }
 

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/StackOptionsPresenterTest.java

 
 import android.app.Activity;
 import android.graphics.Typeface;
+import android.support.v7.widget.ActionMenuView;
 import android.support.v7.widget.Toolbar;
 import android.util.Log;
 import android.view.Gravity;
 
     private TopBar mockTopBar() {
         TopBar topBar = mock(TopBar.class);
+        Toolbar toolbar = new Toolbar(activity);
+        toolbar.addView(new ActionMenuView(activity));
+        when(topBar.getTitleBar()).then(invocation -> toolbar);
         when(topBar.getContext()).then(invocation -> activity);
         return topBar;
     }