.vscode: Fix quotations in windows 'gn gen' task

It seems the tweaks to always force "cmd" to be the shell seemingly changes the way single quotes are handled.  ¯\_(ツ)_/¯

Change-Id: I434066591c968fdfc055a75fa22b7f4c2585b482
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/59029
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Auto-Submit: Ben Clayton <bclayton@google.com>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 7cfc058..9d72ed9 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -92,7 +92,7 @@
             "windows": {
                 "command": "/C",
                 "args": [
-                    "(IF \"${input:buildType}\" == \"Debug\" ( gn gen 'out\\${input:buildType}' --args=is_debug=true ) ELSE ( gn gen 'out\\${input:buildType}' --args=is_debug=false )) && (IF EXIST 'out\\active' rmdir 'out\\active' /q /s) && (mklink /j 'out\\active' 'out\\${input:buildType}')",
+                    "(IF \"${input:buildType}\" == \"Debug\" ( gn gen \"out\\${input:buildType}\" --args=is_debug=true ) ELSE ( gn gen \"out\\${input:buildType}\" --args=is_debug=false )) && (IF EXIST \"out\\active\" rmdir \"out\\active\" /q /s) && (mklink /j \"out\\active\" \"out\\${input:buildType}\")",
                 ],
                 "options": {
                     "shell": {