updater: windows prevents moving file with open file handles

Change-Id: Iebd4886f3d44f816fc06b7c80e7368bbac3d159a

desktop/source/app/updater.cxx

@@ -651,6 +651,7 @@ void download_file(const OUString& rURL, size_t nFileSize, const OUString& rHash
 
     OUString aDestFile = aPatchDirURL + aFileName;
     Updater::log("Destination File: " + aDestFile);
+    aDownloadedFile.close();
     eError = osl::File::move(aTempFile, aDestFile);
     handle_file_error(eError, "Could not move the file from the Temp directory to the user config: TempFile: " + aTempFile + "; DestFile: " + aDestFile);
 }