keys: fix key validation

Pub and private key settings only showed errors if both values were
truthy, but it did not validate if one input was falsy, in which
case it only showed the last error.

Removed truthy check as it is not needed.

src/main.js

@@ -541,7 +541,6 @@ importBtn.addEventListener('click', () => {
 settingsForm.addEventListener('input', () => validKeys(privateKeyInput.value, pubKeyInput.value));
 
 function validKeys(privatekey, pubkey) {
-  if (pubkey && privatekey) {
   try {
     if (getPublicKey(privatekey) === pubkey) {
       statusMessage.hidden = true;
@@ -554,7 +553,6 @@ function validKeys(privatekey, pubkey) {
   } catch (e) {
     statusMessage.textContent = `not a valid private-key: ${e.message || e}`;
   }
-  }
   statusMessage.hidden = false;
   importBtn.setAttribute('disabled', true);
   return false;