fix(windows): error on full index - use cmd.exe-compatible syntax (Fixes #324)

[hippus]

Previously on full index under Windows there is an error after step 5: The filename, directory name, or volume label syntax is incorrect.
This PR fixes cmd.exe syntax

[1/9] Building file structure
  Extracting: N/N files (100%))
[2/9] Extracting definitions
[3/9] Building registry
[4/9] Resolving calls & edges
[5/9] Detecting tests
[7/9] Analyzing git history
[8/9] Linking config files
[9/9] Writing database