Do not change follow counters when already following (#32622)

app/javascript/mastodon/reducers/accounts.ts

@@ -57,7 +57,10 @@ export const accountsReducer: Reducer<typeof initialState> = (
     return state.setIn([action.payload.id, 'hidden'], false);
   else if (importAccounts.match(action))
     return normalizeAccounts(state, action.payload.accounts);
-  else if (followAccountSuccess.match(action)) {
+  else if (
+    followAccountSuccess.match(action) &&
+    !action.payload.alreadyFollowing
+  ) {
     return state
       .update(action.payload.relationship.id, (account) =>
         account?.update('followers_count', (n) => n + 1),