Allow back navigation to home on profile header (#1717)

Navigate back to home if there is no navigation history.

src/view/com/profile/ProfileHeader.tsx

@@ -119,7 +119,11 @@ const ProfileHeaderLoaded = observer(function ProfileHeaderLoadedImpl({
   const [showSuggestedFollows, setShowSuggestedFollows] = React.useState(false)
 
   const onPressBack = React.useCallback(() => {
-    navigation.goBack()
+    if (navigation.canGoBack()) {
+      navigation.goBack()
+    } else {
+      navigation.navigate('Home')
+    }
   }, [navigation])
 
   const onPressAvi = React.useCallback(() => {