cmd: Add '/' to delimiters for tab-completion support.
Improvement:
Since 'cd ../' works in wineconsole, tab completion should too.
- This not like win10 cmd, because 'cd ../' fails there. Interestingly tab completion for 'cd ../' shows results for actual path and not for the parent folder. It fails only after enter like cd command does for using '/' instead of ''.
- wineconsole behaves more like PowerShell on win10, which accepts '/' as delimiter, but it replaces '/' with '' on completion.
Before:
After:

