Remove outdated vformat comments/workarounds in Time.cpp

Time methods returning Strings with both date and time values included were calling vformat twice, as older vformat implementation limited how many arguments could be passed in.  Updated these methods to just call vformat once.

core/os/time.cpp

@@ -233,15 +233,8 @@ Dictionary Time::get_time_dict_from_unix_time(int64_t p_unix_time_val) const {
 String Time::get_datetime_string_from_unix_time(int64_t p_unix_time_val, bool p_use_space) const {
 	UNIX_TIME_TO_HMS
 	UNIX_TIME_TO_YMD
-	// vformat only supports up to 6 arguments, so we need to split this up into 2 parts.
-	String timestamp = vformat("%04d-%02d-%02d", year, (uint8_t)month, day);
-	if (p_use_space) {
-		timestamp = vformat("%s %02d:%02d:%02d", timestamp, hour, minute, second);
-	} else {
-		timestamp = vformat("%sT%02d:%02d:%02d", timestamp, hour, minute, second);
-	}
-
-	return timestamp;
+	const String format_string = p_use_space ? "%04d-%02d-%02d %02d:%02d:%02d" : "%04d-%02d-%02dT%02d:%02d:%02d";
+	return vformat(format_string, year, (uint8_t)month, day, hour, minute, second);
 }
 
 String Time::get_date_string_from_unix_time(int64_t p_unix_time_val) const {
@@ -277,14 +270,8 @@ String Time::get_datetime_string_from_datetime_dict(const Dictionary &p_datetime
 	ERR_FAIL_COND_V_MSG(p_datetime.is_empty(), "", "Invalid datetime Dictionary: Dictionary is empty.");
 	EXTRACT_FROM_DICTIONARY
 	VALIDATE_YMDHMS("")
-	// vformat only supports up to 6 arguments, so we need to split this up into 2 parts.
-	String timestamp = vformat("%04d-%02d-%02d", year, (uint8_t)month, day);
-	if (p_use_space) {
-		timestamp = vformat("%s %02d:%02d:%02d", timestamp, hour, minute, second);
-	} else {
-		timestamp = vformat("%sT%02d:%02d:%02d", timestamp, hour, minute, second);
-	}
-	return timestamp;
+	const String format_string = p_use_space ? "%04d-%02d-%02d %02d:%02d:%02d" : "%04d-%02d-%02dT%02d:%02d:%02d";
+	return vformat(format_string, year, (uint8_t)month, day, hour, minute, second);
 }
 
 int64_t Time::get_unix_time_from_datetime_dict(const Dictionary &p_datetime) const {
@@ -352,15 +339,8 @@ Dictionary Time::get_time_dict_from_system(bool p_utc) const {
 
 String Time::get_datetime_string_from_system(bool p_utc, bool p_use_space) const {
 	OS::DateTime dt = OS::get_singleton()->get_datetime(p_utc);
-	// vformat only supports up to 6 arguments, so we need to split this up into 2 parts.
-	String timestamp = vformat("%04d-%02d-%02d", dt.year, (uint8_t)dt.month, dt.day);
-	if (p_use_space) {
-		timestamp = vformat("%s %02d:%02d:%02d", timestamp, dt.hour, dt.minute, dt.second);
-	} else {
-		timestamp = vformat("%sT%02d:%02d:%02d", timestamp, dt.hour, dt.minute, dt.second);
-	}
-
-	return timestamp;
+	const String format_string = p_use_space ? "%04d-%02d-%02d %02d:%02d:%02d" : "%04d-%02d-%02dT%02d:%02d:%02d";
+	return vformat(format_string, dt.year, (uint8_t)dt.month, dt.day, dt.hour, dt.minute, dt.second);
 }
 
 String Time::get_date_string_from_system(bool p_utc) const {