gen: removes space on struct printing (#6535)

vlib/v/tests/enum_default_value_in_struct_test.v

@@ -1,10 +1,10 @@
-pub enum MyEnum {
+enum MyEnum {
 	first = 20
 	second
 	third
 }
 
-pub struct MyStruct {
+struct MyStruct {
 mut:
 	e MyEnum = .second
 }