make wifi settings a bit nicer

selfdrive/ui/qt/offroad/wifi.cc

@@ -147,14 +147,12 @@ void WifiUI::refresh() {
         QPushButton {
           padding: 0;
           font-size: 50px;
+          border-radius: 10px;
           background-color: #114265;
         }
         QPushButton:disabled {
           background-color: #323C43;
         }
-        * {
-          background-color: #114265;
-        }
       )");
       countWidgets++;
     }
@@ -192,9 +190,6 @@ void WifiUI::refresh() {
     QPushButton:disabled {
       background-color: #323C43;
     }
-    * {
-      background-color: #114265;
-    }
   )");
   vlayout->addWidget(w);
 }