Fixes #3290 Pico title bar fixes (#3302)

* Fixes Pico title bar tint issue

* Use setValue for a faster title bar visibility switch

Author: keianhzo

app/src/common/shared/org/mozilla/vrbrowser/ui/viewmodel/WindowViewModel.java

@@ -551,7 +551,7 @@ public MutableLiveData<ObservableBoolean> getIsActiveWindow() {
     }
 
     public void setIsActiveWindow(boolean isActiveWindow) {
-        this.isActiveWindow.postValue(new ObservableBoolean(isActiveWindow));
+        this.isActiveWindow.setValue(new ObservableBoolean(isActiveWindow));
     }
 
     @NonNull

app/src/main/res/layout/title_bar.xml

@@ -72,6 +72,7 @@
                 android:paddingEnd="5dp"
                 android:requiresFadingEdge="horizontal"
                 android:singleLine="true"
+                android:textColor="@color/fog"
                 tools:text="@{viewmodel.titleBarUrl}" />
         </LinearLayout>