Show MUC history on intentional reconnect

Small bug caused by 13675fb and ce5a4ed.
Fix https://github.com/profanity-im/profanity/issues/1142

src/event/common.h

@@ -36,5 +36,9 @@
 #define EVENT_COMMON_H
 
 void ev_disconnect_cleanup(void);
+void ev_inc_connection_counter(void);
+void ev_reset_connection_counter(void);
+gboolean ev_was_connected_already(void);
+gboolean ev_is_first_connect(void);
 
 #endif