JET-140 Change function type syntax

and tests for
JET-168 Improve the parser for function and tuple types as receiver types

idea/testData/codegen/classes/closureWithParameter.jet

@@ -2,6 +2,6 @@ fun box() : String {
     return apply( "OK", {(arg: String) => arg } )
 }
 
-fun apply(arg : String, f : {(p:String) : String}) : String {
+fun apply(arg : String, f : fun (p:String) : String) : String {
     return f(arg)
 }