Fix dropdown labels

Author: animator

lib/screens/common_widgets/auth/digest_auth_fields.dart

@@ -91,7 +91,7 @@ class _DigestAuthFieldsState extends State<DigestAuthFields> {
           SizedBox(height: 4),
           ADPopupMenu<String>(
             value: _algorithmController.trim(),
-            values: kDigestAlgos.map((i) => (i, null)),
+            values: kDigestAlgos.map((i) => (i, i)),
             tooltip: kTooltipAlgorithm,
             isOutlined: true,
             onChanged: widget.readOnly

lib/screens/common_widgets/auth/jwt_auth_fields.dart

@@ -80,7 +80,7 @@ class _JwtAuthFieldsState extends State<JwtAuthFields> {
         SizedBox(height: 4),
         ADPopupMenu<String>(
           value: _algorithm,
-          values: kJwtAlgos.map((i) => (i, null)),
+          values: kJwtAlgos.map((i) => (i, i)),
           tooltip: kTooltipJWTAlgo,
           isOutlined: true,
           onChanged: widget.readOnly