Update stm32f3xx_ll_rtc.c

[DoHelloWorld]

Fixed wrong RTC RS flag status waiting.

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[ASELSTM]

Hi @DoHelloWorld,

Thank you for your contribution. We are actually aware about the point you raised out it has been addressed and fixed internally.

This fix will be made available in the frame of a future release. So stay tuned and thank you once more for your contribution and for your patience.

With regards

[ASELSTM]

ST Internal Reference: 84207