Refactor <SID> with original script ID

[blasco]

First of all, thank you for the great plugin! It really helps to boost productivity and to break the bad habits.

I have one problem with it, it clashes with kana's vim-arpeggio. I thought it was a problem in vim-arpeggio and so I reported the issue in kana's repository. He pointed out that the problem is in the way the mappings are defined in vim-hardtime:

https://github.com/kana/vim-arpeggio/issues/21#issuecomment-544248752

Could this be updated so it doesn't clash with other plugins? Thank you very much.