prosody: use mod_smacks.lua from prosody since 0.12.4

prosody/Dockerfile

@@ -47,6 +47,7 @@ RUN wget -qO /etc/apt/trusted.gpg.d/prosody.gpg https://prosody.im/files/prosody
       lua-unbound && \
     apt-dpkg-wrap apt-get -d install -y jitsi-meet-prosody && \
     dpkg -x /var/cache/apt/archives/jitsi-meet-prosody*.deb /tmp/pkg && \
+    rm /tmp/pkg/usr/share/jitsi-meet/prosody-plugins/mod_smacks.lua && \
     mv /tmp/pkg/usr/share/jitsi-meet/prosody-plugins /prosody-plugins && \
     rm -rf /tmp/pkg /var/cache/apt && \
     apt-cleanup && \