Fix add/edit moderation list form placeholder text (#9074)

* fix placeholder text of modlist dialog

* change header font weight

* fix string

src/components/Dialog/shared.tsx

@@ -62,7 +62,7 @@ export function HeaderText({
   style?: StyleProp<TextStyle>
 }) {
   return (
-    <Text style={[a.text_lg, a.text_center, a.font_bold, style]}>
+    <Text style={[a.text_lg, a.text_center, a.font_semi_bold, style]}>
       {children}
     </Text>
   )