Revert "Bump v17.0.0-nightly.20210927"

This reverts commit 104e0f3059.

ELECTRON_VERSION

@@ -1 +1 @@
-17.0.0-nightly.20210927
+17.0.0-nightly.20210924

package.json

@@ -1,6 +1,6 @@
 {
   "name": "electron",
-  "version": "17.0.0-nightly.20210927",
+  "version": "17.0.0-nightly.20210924",
   "repository": "https://github.com/electron/electron",
   "description": "Build cross platform desktop apps with JavaScript, HTML, and CSS",
   "devDependencies": {

shell/browser/resources/win/electron.rc

@@ -50,8 +50,8 @@ END
 //
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION 17,0,0,20210927
- PRODUCTVERSION 17,0,0,20210927
+ FILEVERSION 17,0,0,20210924
+ PRODUCTVERSION 17,0,0,20210924
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L