Only set the dialog title if not already set in the extension (#9858)

Only set the dialog title if not already set in the extension.

app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/details/SourcePreferencesScreen.kt

@@ -147,7 +147,7 @@ class SourcePreferencesFragment : PreferenceFragmentCompat() {
         sourceScreen.forEach { pref ->
             pref.isIconSpaceReserved = false
             pref.isSingleLineTitle = false
-            if (pref is DialogPreference) {
+            if (pref is DialogPreference && pref.dialogTitle.isNullOrEmpty()) {
                 pref.dialogTitle = pref.title
             }