Rename MessageComposerInput.insertTrailingComma to MessageComposerInput.insertTrailingColon (#7981)

src/settings/Settings.tsx

@@ -429,7 +429,7 @@ export const SETTINGS: {[setting: string]: ISetting} = {
         default: true,
         controller: new UIFeatureController(UIFeature.Widgets, false),
     },
-    "MessageComposerInput.insertTrailingComma": {
+    "MessageComposerInput.insertTrailingColon": {
         supportedLevels: LEVELS_ACCOUNT_SETTINGS,
         displayName: _td('Insert a trailing colon after user mentions at the start of a message'),
         default: true,

src/settings/handlers/AccountSettingsHandler.ts

@@ -121,7 +121,7 @@ export default class AccountSettingsHandler extends MatrixClientBackedSettingsHa
             return content[settingName];
         }
 
-        if (settingName === "MessageComposerInput.insertTrailingComma") {
+        if (settingName === "MessageComposerInput.insertTrailingColon") {
             const content = this.getSettings() || {};
             const value = content[settingName];
             if (value === null || value === undefined) {