Use functional update in useEffect

From react-hooks/exhaustive-deps warning:

  React Hook useEffect has missing dependencies: 'getGroupLogo' and
  'logo'. Either include them or remove the dependency array. You can
  also do a functional update 'setLogo(l => ...)' if you only need
  'logo' in the 'setLogo' call

static-site/src/components/Groups/edit-logo-form.jsx

@@ -13,7 +13,7 @@ const EditLogoForm = ({ groupName, createErrorMessage, clearErrorMessage }) => {
   useEffect(() => {
     const setCurrentLogo = async () => {
       const currentLogo = await getGroupLogo();
-      if (!cleanUp) setLogo({ ...logo, current: currentLogo });
+      if (!cleanUp) setLogo(l => ({ ...l, current: currentLogo }));
     }
 
     let cleanUp = false;