ui: remove some more non-null assertions on binding fields

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

ui/src/main/java/com/wireguard/android/fragment/TunnelDetailFragment.kt

@@ -43,7 +43,7 @@ class TunnelDetailFragment : BaseFragment() {
         super.onCreateView(inflater, container, savedInstanceState)
         binding = TunnelDetailFragmentBinding.inflate(inflater, container, false)
         binding?.executePendingBindings()
-        return binding!!.root
+        return binding?.root
     }
 
     override fun onDestroyView() {

ui/src/main/java/com/wireguard/android/fragment/TunnelListFragment.kt

@@ -101,7 +101,7 @@ class TunnelListFragment : BaseFragment() {
             }
             executePendingBindings()
         }
-        return binding!!.root
+        return binding?.root
     }
 
     override fun onDestroyView() {