checker: no notice for interface field initialized struct with ...other syntax (#18405)

vlib/v/checker/struct.v

@@ -660,7 +660,7 @@ fn (mut c Checker) struct_init(mut node ast.StructInit, is_field_zero_struct_ini
 					}
 				}
 				if !field.typ.has_flag(.option) && sym.kind == .interface_
-					&& (!has_noinit && sym.language != .js) {
+					&& (!has_noinit && sym.language != .js) && !node.has_update_expr {
 					// TODO: should be an error instead, but first `ui` needs updating.
 					c.note('interface field `${type_sym.name}.${field.name}` must be initialized',
 						node.pos)

vlib/v/slow_tests/inout/interface_field_initialised_struct_update_expr.out

@@ -0,0 +1,5 @@
+[vlib/v/slow_tests/inout/interface_field_initialised_struct_update_expr.vv:20] o: Outer{
+    a: Foo(FooImpl{
+        prop: 0
+    })
+}

vlib/v/slow_tests/inout/interface_field_initialised_struct_update_expr.vv

@@ -0,0 +1,21 @@
+interface Foo {
+	prop int
+}
+
+struct FooImpl {
+	prop int
+}
+
+struct Outer {
+	a Foo
+}
+
+fn main() {
+	other := Outer{
+		a: FooImpl{}
+	}
+	o := Outer{
+		...other
+	}
+	dump(o)
+}