Add missing header file

Signal/SignalUBSan.supp

@@ -7,6 +7,10 @@ bool:YapDatabaseAutoViewTransaction.m
 # SocketRocket
 bool:SRWebSocket.m
 
+# SQLCipher
+shift-base:sqlite3.c
+shift-exponent:sqlite3.c
+
 # Curve25519 expected
 shift-base:curve25519-donna.c
 shift-base:ge_scalarmult_base.c

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -54,6 +54,7 @@
 #import <SignalMessaging/OWSNavigationController.h>
 #import <SignalMessaging/OWSUnreadIndicator.h>
 #import <SignalMessaging/OWSUserProfile.h>
+#import <SignalMessaging/SignalMessaging-Swift.h>
 #import <SignalMessaging/ThreadUtil.h>
 #import <SignalMessaging/UIUtil.h>
 #import <SignalMessaging/UIViewController+OWS.h>