removed useDispatch from import statement in ErrorContainer, and fixed ErrorMsg to pass all tests

Author: AndrewByun

src/app/__tests__/ErrorContainer.test.tsx

@@ -5,7 +5,7 @@ import ErrorContainer from '../containers/ErrorContainer';
 // import { useStoreContext } from '../store';
 import { configureStore } from '@reduxjs/toolkit';
 import { mainSlice } from '../RTKslices'
-import { useDispatch, Provider } from 'react-redux';
+import { Provider } from 'react-redux';
 
 const customTabs = {
   87: {

src/app/__tests__/ErrorMsg.test.tsx

@@ -26,7 +26,7 @@ describe('unit testing for ErrorContainer.tsx', () => {
       props.status.reactDevToolsInstalled = false;
       render(<ErrorMsg {...props} />);
       expect(
-        screen.getByText('React Dev Tools isnt installed!', { exact: false }),
+        screen.getByText('React Dev Tools is not installed!', { exact: false }), //edited this to say is not installed instead of isn't, matches the expected return string from ErrorMsg.tsx
       ).toBeInTheDocument();
       props.status.reactDevToolsInstalled = true;
     });