fixup number-only event verifier to allow enter

tfweb/src/routes/auth/mfa/+page.svelte

@@ -69,6 +69,7 @@
     }
 
     function validateKeypress(e: KeyboardEvent) {
+        if (e.charCode === 13) { return; }
         if (e.charCode < 47 || e.charCode > 57) {
             e.preventDefault();
         }

tfweb/src/routes/auth/mfasetup/+page.svelte

@@ -67,6 +67,7 @@
     });
 
     function validateInput(e: KeyboardEvent) {
+        if (e.charCode === 13) { return; }
         if (e.charCode < 47 || e.charCode > 57) {
             e.preventDefault();
         }