Changes in hlint config file should be applied on the fly

[jneira]

(from twitter: https://twitter.com/korayal/status/1326963429257711623)

• I describe that behaviour prematurely in docs but it does not work
• We should change getHlintSettingsRule from defineNoFile to a definition that takes in account possible configuration files to rerun the rule

haskell-language-server/plugins/hls-hlint-plugin/src/Ide/Plugin/Hlint.hs

Lines 218 to 223 in 61c69fd

	getHlintSettingsRule :: HlintUsage -> Rules ()
	getHlintSettingsRule usage =
	defineNoFile $ \GetHlintSettings ->
	liftIO $ case usage of
	HlintEnabled cmdArgs -> argsSettings cmdArgs
	HlintDisabled -> fail "hlint configuration unspecified"

[Profpatsch]

Seconded, I run into this every time I change the hlint file.