Bug fix

https://github.com/2dust/v2rayNG/issues/3426

V2rayNG/app/src/main/res/xml/pref_settings.xml

@@ -109,13 +109,13 @@
 
         <EditTextPreference
             android:inputType="number"
-            android:key="pref_mux_concurency"
+            android:key="pref_mux_concurrency"
             android:summary="8"
             android:title="@string/title_pref_mux_concurency" />
 
         <EditTextPreference
             android:inputType="number"
-            android:key="pref_mux_xudp_concurency"
+            android:key="pref_mux_xudp_concurrency"
             android:summary="8"
             android:title="@string/title_pref_mux_xudp_concurency" />