[fenix] No issue: Add back updateThemeForSession in onResume

app/src/main/java/org/mozilla/fenix/browser/BrowserFragment.kt

@@ -26,6 +26,7 @@ import mozilla.components.feature.tabs.WindowFeature
 import mozilla.components.lib.state.ext.consumeFrom
 import mozilla.components.support.base.feature.UserInteractionHandler
 import mozilla.components.support.base.feature.ViewBoundFeatureWrapper
+import org.mozilla.fenix.HomeActivity
 import org.mozilla.fenix.R
 import org.mozilla.fenix.components.FenixSnackbar
 import org.mozilla.fenix.components.TabCollectionStorage
@@ -146,6 +147,9 @@ class BrowserFragment : BaseBrowserFragment(), UserInteractionHandler {
 
     override fun onResume() {
         super.onResume()
+        getSessionById()?.let {
+            (activity as HomeActivity).updateThemeForSession(it)
+        }
         requireComponents.core.tabCollectionStorage.register(collectionStorageObserver, this)
     }