UI/UX: change navbar style as to prevent blending with bg colors

Change-Id: I3c4edcb1d5cd90442705aff6f5d71906424c3d05
Reviewed-by: Kateryna Kostiuk <kateryna.kostiuk@savoirfairelinux.com>

Ring/Ring/TabBar/BaseViewController.swift

@@ -54,6 +54,7 @@ class BaseViewController: UINavigationController {
     }
     convenience init(with type: TabBarItemType) {
         self.init()
+        self.navigationBar.isTranslucent = false
         self.tabBarItem = type.tabBarItem
     }
 }