[Android] Top bar item colors - fix (#26964)

* [Android] Top bar item colors - fix

* Avoid tab icon tint for FontImageSource on Android

Prevents applying TabIconTint when the tab icon is a FontImageSource, as it manages its own color. This ensures correct icon coloring for font-based icons in TabbedPageManager.

Author: kubaflo

src/Controls/src/Core/Platform/Android/TabbedPageManager.cs

@@ -890,6 +890,12 @@ void SetIconColorFilter(Page page, TabLayout.Tab tab, bool selected)
 
 					icon.Mutate();
 					icon.SetState(_stateSet);
+
+					// The FontImageSource has its own color, so we don't need to apply the tint list.
+					if (page.IconImageSource is not FontImageSource)
+					{
+						_tabLayout.TabIconTint = colors;
+					}
 					ADrawableCompat.SetTintList(icon, colors);
 				}
 			}