Insteon: Fix Path Comparison in Windows for Update_Docs.pl

If inode==0 then we are probably on windows, so use abs_path to compare the two paths and see if they are the same.

I don't have windows so hopefully this works.

Fixes hollie/misterhouse#234
Merge pull request #238 from krkeegan/fix_issue_234

Insteon: Fix Path Comparison in Windows for Update_Docs.pl