fix(#I10GQT): 角色对菜单授权窗口固定高度

#Comment
comment #I10GQT

#Issue
close https://gitee.com/LongbowEnterprise/dashboard/issues?id=I10GQT

Bootstrap.Admin/Views/Shared/NavigatorConfig.cshtml

@@ -5,7 +5,7 @@
                 <h5 class="modal-title" id="myMenuModalLabel">请选择菜单</h5>
                 <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
             </div>
-            <div class="modal-body">
+            <div class="modal-body modal-body-fixed">
                 <div class="dd" id="nestable_menu">
                     <ol class="dd-list"></ol>
                 </div>

Bootstrap.Admin/wwwroot/css/theme-responsive.css

@@ -122,4 +122,8 @@
     .modal-xl {
         max-width: 1100px;
     }
+
+    .modal-body-fixed {
+        max-height: calc(80vh);
+    }
 }

Bootstrap.Admin/wwwroot/css/theme.css

@@ -457,6 +457,11 @@ input.pending {
     padding: 15px 15px 0 15px;
 }
 
+.modal-body-fixed {
+    max-height: calc(54vh);
+    overflow-y: auto;
+}
+
 .card {
     margin-bottom: 15px;
     box-shadow: 0 0 8px 0 rgba(0,0,0,.075), 0 2px 4px 0 rgba(255,255,255,0);