Remove offensive haskell snippets

Haskell snippets won't show up in autocomplete because of this. 
https://github.com/Valloric/YouCompleteMe/issues/1214

snippets/haskell.snippets

@@ -57,20 +57,14 @@ snippet ap
 snippet do
 	do
 
-snippet λ
-	\\${1:x} -> ${0:expression}
 snippet \
 	\\${1:x} -> ${0:expression}
 snippet (\
 	(\\${1:x} -> ${0:expression})
 snippet <-
 	${1:a} <- ${0:m a}
-snippet ←
-	${1:a} <- ${0:m a}
 snippet ->
 	${1:m a} -> ${0:a}
-snippet →
-	${1:m a} -> ${0:a}
 snippet tup
 	(${1:a}, ${0:b})
 snippet tup2