fix: minor stuff

lib/encryption/utils/key_verification.dart

@@ -637,8 +637,7 @@ class KeyVerification {
         }.contains(type)) {
           final deviceKeys = client.userDeviceKeys[userId]?.deviceKeys;
           deviceKeys?.removeWhere((_, value) =>
-              value.hasValidSignatureChain(verifiedByTheirMasterKey: true) ==
-              false);
+              !value.hasValidSignatureChain(verifiedByTheirMasterKey: true));
           if (deviceKeys != null) {
             await client.sendToDeviceEncrypted(
               deviceKeys.values.toList(),

lib/src/utils/device_keys_list.dart

@@ -221,7 +221,7 @@ abstract class SignableKey extends MatrixSignableKey {
     Set<String>? visited,
     Set<String>? onlyValidateUserIds,
 
-    /// Only check if this key is verified by any Master key.
+    /// Only check if this key is verified by their Master key.
     bool verifiedByTheirMasterKey = false,
   }) {
     if (!client.encryptionEnabled) {