checker: fix fn returning ![]string called in main (#16023)

vlib/v/checker/containers.v

@@ -121,7 +121,7 @@ pub fn (mut c Checker) array_init(mut node ast.ArrayInit) ast.Type {
 			c.expected_type.clear_flag(.shared_f).deref()
 		} else {
 			c.expected_type
-		}.clear_flag(.optional)
+		}.clear_flag(.optional).clear_flag(.result)
 	}
 	// [1,2,3]
 	if node.exprs.len > 0 && node.elem_type == ast.void_type {

vlib/v/tests/fn_return_opt_or_res_of_array_test.v

@@ -0,0 +1,13 @@
+fn foo_res() ![]string {
+	return []
+}
+
+fn foo_opt() ?[]string {
+	return []
+}
+
+fn test_fn_return_opt_or_res_of_array() {
+	foo_res() or { panic(err) }
+	foo_opt() or { panic(err) }
+	assert true
+}