profanity: Introduce OMEMO fix

It looks like the entire 0.9-series has some OMEMO issues where messages
will appear to be sent, but in reality they're not. This patch has been
picked from the upstream repo and addresses the issue so that OMEMO is
back in a usable state.

My thanks to @aszlig for helping and testing this.

pkgs/applications/networking/instant-messengers/profanity/default.nix

@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub, autoreconfHook, pkgconfig, glib, openssl
 , glibcLocales, expect, ncurses, libotr, curl, readline, libuuid
-, cmocka, libmicrohttpd, expat, sqlite, libmesode
+, cmocka, libmicrohttpd, expat, sqlite, libmesode, fetchpatch
 , autoconf-archive
 
 , autoAwaySupport ? true,       libXScrnSaver ? null, libX11 ? null
@@ -32,6 +32,10 @@ stdenv.mkDerivation rec {
   };
 
   patches = [
+    (fetchpatch {
+      url = "https://github.com/profanity-im/profanity/commit/54667c022f17bdb547c3b8b4eec1c2889c9d60f3.patch";
+      sha256 = "0aqrq45im1qnq308hyhh7dqbggzmcqb0b868wr5v8v08pd94s45k";
+    })
     ./patches/packages-osx.patch
   ];