Make structs packed by default

Signed-off-by: Slendi <slendi@socopon.com>

src/parser.odin

@@ -141,11 +141,11 @@ parser_parse_struct_definition :: proc(parser: ^Parser) -> ^Node {
 		expect(parser, .Identifier)
 		return nil
 	}
-	is_packed := false
+	is_packed := true
 	if parser.tok.kind == .String {
 		value := parser.tok.value.([dynamic]u8)
-		if compare_dyn_arr_string(&value, "packed") {
-			is_packed = true
+		if compare_dyn_arr_string(&value, "unpacked") {
+			is_packed = false
 		} else {
 			panic("TODO, unknown struct attribute")
 		}