修正选择文件API错误

src/Common/FileSystem.ts

@@ -358,13 +358,13 @@ export class FileSystem
      */
     static ChooseFile({ filter, multiple = false, callback }: { filter?: string; multiple?: boolean; callback: (filelist: FileList) => void; })
     {
-        if (!this.chooserInput)
-        {
-            this.chooserInput = document.createElement("input");
-            this.chooserInput.type = "file";
-            this.chooserInput.style.display = "none";
-            document.body.appendChild(this.chooserInput);
-        }
+        if (this.chooserInput)
+            this.chooserInput.remove();
+
+        this.chooserInput = document.createElement("input");
+        this.chooserInput.type = "file";
+        this.chooserInput.style.display = "none";
+        document.body.appendChild(this.chooserInput);
 
         this.chooserInput.accept = filter;
         this.chooserInput.onchange = () =>