check for empty space before //

[ctf0]

🐛 Describe the bug
when using @sync host=something the ext will comment and uncomment the next line based on the active host, however the regex responsible for that is not correct because it simply removes any // which affects text like file:///C:/Users/abc/....

🌴 Visual Studio Code Version : 1.33.1
🌴 Code Settings Sync Version : 3.2.9
🌴 Standard or Insiders : Standard
🌴 Portable or Installed : Installed
🌴 OSS or Official Build : Official
🌴 Operating System : windows 7
🌴 Occurs On: Download
🌴 Proxy Enabled: No
🌴 Gist Id: [ ID_HERE ]

📰 To Reproduce
Steps to reproduce the behavior:

1. https://github.com/be5invis/vscode-custom-css#getting-started

💪 Expected behavior
regex should check if // have a space before it to make sure its a comment not a path.

[shanalikhan]

Duplicate of #865

[shanalikhan]

cc : @ioprotium