Calling `indent-line-function` may result in unwanted indentation

[Hi-Angel]

For some reason, purescript-indentation.el instead of implementing just a single indentation function has implemented two of them: purescript-newline-and-indent and purescript-indentation-indent-line (aka indent-line-function). As result, whenever a minor-mode binding calls indent-line-function, this results in indentation being zero.

For example, if you call evil-open-below after type declaration, it will get indented even though it shouldn't.

The two functions should be unified, I think.

Steps to reproduce

1. Open purescript-mode buffer with text:

   type Foo = {}

2. Start new line after the text and evaluate (funcall indent-line-function)

Expected

No indentation

Actual

Indentation gets added