Add test case and fix for space in function parameter type inference

close #31

Author: NathanLovato

tests/expected/function_parameters_type_inference.gd

@@ -0,0 +1,7 @@
+# Type inference should stay without space between : and = (issue #31)
+func set_avatar_at(at := AvatarAt.LEFT) -> void:
+	pass
+
+
+func test_type_inference(a := 1, b := "string", c := true) -> void:
+	pass

tests/input/function_parameters_type_inference.gd

@@ -0,0 +1,7 @@
+# Type inference should stay without space between : and = (issue #31)
+func set_avatar_at(at := AvatarAt.LEFT) -> void:
+	pass
+
+
+func test_type_inference(a := 1, b := "string", c := true) -> void:
+	pass