fix(chat/messages): ensure there is only one label for given date

Covers the case, where timestamps are missynchronized:
```
clock: 0 timestamp: 31.12.2022 10:00:00
clock: 1 timestamp: 01.01.2023 23:59:30
clock: 2 timestamp: 01.01.2023 23:59:45
clock: 3 timestamp: 02.01.2023 00:00:05
clock: 4 timestamp: 02.01.2023 00:00:10
clock: 5 timestamp: 01.01.2023 23:59:55
```

Before, it would result in repeated labels:
```
clock: 0 timestamp: 31.12.2022 10:00:00
    LABEL: 1.01.2023
clock: 1 timestamp: 01.01.2023 23:59:30
clock: 2 timestamp: 01.01.2023 23:59:45
    LABEL: 2.01.2023
clock: 3 timestamp: 02.01.2023 00:00:05
clock: 4 timestamp: 02.01.2023 00:00:10
    LABEL: 1.01.2023
clock: 5 timestamp: 01.01.2023 23:59:55
```

fixes: #8962

ui/StatusQ/src/StatusQ/Components/StatusDateGroupLabel.qml

@@ -18,8 +18,8 @@ StatusBaseText {
         const currentMsgDate = new Date(messageTimestamp)
         const prevMsgDate = new Date(previousMessageTimestamp)
 
-        if (prevMsgDate > 0 && currentMsgDate.getDay() === prevMsgDate.getDay())
-            return "";
+        if (prevMsgDate > 0 && currentMsgDate.getDay() <= prevMsgDate.getDay())
+            return ""
 
         const now = new Date();
         // FIXME Qt6: replace with Intl.DateTimeFormat