Fix typo in code

[TwiN]

gatus/storage/store/memory/uptime.go

Lines 32 to 36 in 54221ef

	// Note that this is only triggered when there are more entries than there should be after
	// 32 days, despite the fact that we are deleting everything that's older than 30 days.
	// This is to prevent re-iterating on every `processUptimeAfterResult` as soon as the uptime has been logged for 30 days.
	if len(uptime.HourlyStatistics) > uptimeCleanUpThreshold {
	sevenDaysAgo := time.Now().Add(-(uptimeRetention + time.Hour)).Unix()

sevenDaysAgo should be somethinglike timeBeforeUptimeRetention or something along those lines

[laukik-target]

Assign me please.