fix UrlCombine so that it handles leading and trailing path delimiters and returns proper paths

Oqtane.Client/Modules/Admin/Files/Edit.razor

@@ -67,6 +67,7 @@
             </div>
         </div>
     </form>
+    <br /><br />
 
     @if (!_isSystem)
     {
@@ -79,8 +80,7 @@
         @((MarkupString)"&nbsp;")
         <ActionDialog Header="Delete Folder" Message="Are You Sure You Wish To Delete This Folder?" Action="Delete" Security="SecurityAccessLevel.Admin" Class="btn btn-danger" OnClick="@(async () => await DeleteFolder())" ResourceKey="DeleteFolder" />
     }
-    <br />
-    <br />
+    <br /><br />
     @if (PageState.QueryString.ContainsKey("id"))
     {
         <AuditInfo CreatedBy="@_createdBy" CreatedOn="@_createdOn" ModifiedBy="@_modifiedBy" ModifiedOn="@_modifiedOn"></AuditInfo>