Comment lines affect indentation

[usualwitch]

Describe the bug
If a comment line ends with one of the patterns defined in https://github.com/ionide/Ionide-vim/blob/master/indent/fsharp.vim#L189, the next line will be indented.

To Reproduce
Write a comment that ends with any word from this list begin\|do\|else\|fun\|function\|functor\|if\|initializer\|object\|private\|sig\|struct\|then\|try then press enter. The next line will be shifted right.

Expected behaviour
Comment lines should not change indentation.

[cannorin]

@usualwitch Note that #71 is not perfect: it will still increase indentation within ranged comments (* ... *) since there is apparently no efficient way for Vim's indent file to know if the current position is within ranged comment.

It will fix the following case, though:

// begin
// something