Change named exports to default exports for mui icons

This is to reduce transfer size when users load the page for the first time

Change-Id: I3215b7099bcdbea7b446da599810f5951407bbdb
diff --git a/client/src/components/Button.tsx b/client/src/components/Button.tsx
index 92ef37d..3aff314 100644
--- a/client/src/components/Button.tsx
+++ b/client/src/components/Button.tsx
@@ -15,7 +15,9 @@
  * License along with this program.  If not, see
  * <https://www.gnu.org/licenses/>.
  */
-import { QuestionMark, RadioButtonChecked, RadioButtonUnchecked } from '@mui/icons-material';
+import QuestionMark from '@mui/icons-material/AddCircle';
+import RadioButtonChecked from '@mui/icons-material/AddCircle';
+import RadioButtonUnchecked from '@mui/icons-material/AddCircle';
 import {
   Box,
   ClickAwayListener,