chore(sltt-app): add quotes for xcopy cmd

Author: ericpyle

package.json

@@ -24,7 +24,7 @@
     "find:auth0_client_id:target": "findstr /S /M /C:\"REACT_APP_AUTH0_CLIENT_ID:\\\"eTewsjcscudtGHteG3u86YEDwHUTRd6Z\\\"\" out\\client\\static\\js\\main.*.chunk.js",
     "find:auth0_client_id:source": "findstr /S /M /C:\"REACT_APP_AUTH0_CLIENT_ID:\\\"eTewsjcscudtGHteG3u86YEDwHUTRd6Z\\\"\" %SLTT_CLIENT_DIR%/build/static/js/main.*.chunk.js",
     "rmdir:build:client": "if exist \".\\out\\client\" rmdir /s /q \".\\out\\client\"",
-    "copy:build:client": "npm run find:version:source && npm run find:auth0_client_id:source && npm run rmdir:build:client && xcopy %SLTT_CLIENT_DIR%\\build .\\out\\client\\ /s /e /y",
+    "copy:build:client": "npm run find:version:source && npm run find:auth0_client_id:source && npm run rmdir:build:client && xcopy \"%SLTT_CLIENT_DIR%\\build\" .\\out\\client\\ /s /e /y",
     "build:win:norelease": "npm run build && electron-builder --win --config --publish never",
     "build:win:prerelease": "npm run build && electron-builder --win --config --publish onTagOrDraft --prerelease",
     "build:win:draft": "npm run build && electron-builder --win --config --publish onTagOrDraft",