Add bouncing of userpics in group call members.

Telegram/SourceFiles/data/data_group_call.h

@@ -37,6 +37,8 @@ public:
 		std::optional<Participant> now;
 	};
 
+	static constexpr auto kSpeakStatusKeptFor = crl::time(1000);
+
 	[[nodiscard]] auto participants() const
 		-> const std::vector<Participant> &;
 	void requestParticipants();