Fix wrong code point in 𫟷 XML comment

Author: yawnoc

app/src/main/res/layout/main_activity.xml

@@ -139,7 +139,7 @@
       app:minimumCandidate="𠀤"
       app:maximumCandidate="𠀤"
     />
-    <!-- Selected characters from CJK Unified Ideographs Extension B (simplified 鉝): U+20024 -->
+    <!-- Selected characters from CJK Unified Ideographs Extension B (simplified 鉝): U+2B7F7 -->
     <io.github.yawnoc.strokeinput.OptionalCandidatesSwitch
       style="@style/MainActivitySwitch"
       android:id="@+id/optional_simplified_livermorium_switch"