lsp-mode interferes with buffer indent set-up even when lsp-enable-indentation is nil

[gdanov]

Describe the bug
I'm trying to use lsp-mode alongside Cider (for clojure development). I want to use cider's buffer formatting. (setq lsp-enable-indentation nil) does not help. The result is that some vars set-up by cider are set to nil (example: indent-region-function).

To Reproduce
add lsp-mode and lsp-clojure to vanilla prelude emacs, open clojure buffer and try to use cider's formatting...

Expected behavior
I'd expect that lsp-mode does not touch anything formatting related when indent-region-function is nil

Which Language Server did you use
lsp-clojure

OS
os x

Error callstack
nothing useful in any of the log bufers

[yyoncho]

We should unset indent-region-function only if it is set to lsp-mode's formatting function.