fmt: do not remove chan type of struct fields (#8948)

vlib/v/fmt/fmt.v

@@ -666,7 +666,7 @@ pub fn (mut f Fmt) struct_decl(node ast.StructDecl) {
 	mut field_types := []string{cap: node.fields.len}
 	for i, field in node.fields {
 		mut ft := f.no_cur_mod(f.table.type_to_str(field.typ))
-		if !ft.contains('C.') && !ft.contains('JS.') && !ft.contains('fn (') {
+		if !ft.contains('C.') && !ft.contains('JS.') && !ft.contains('fn (') && !ft.contains('chan') {
 			ft = f.short_module(ft)
 		}
 		field_types << ft

vlib/v/fmt/tests/chan_init_keep.vv

@@ -1,3 +1,9 @@
+import some_mod
+
+struct ChanFieldType {
+	c chan some_mod.Type
+}
+
 struct FSMEvent {
 	x int
 }