Change http limit

src/freedombone-app-xmpp

     echo '' >> /etc/prosody/prosody.cfg.lua
     echo 'Include "conf.d/*.cfg.lua"' >> /etc/prosody/prosody.cfg.lua
     echo 'http_upload_path = "/var/lib/prosody/http_uploads"' >> /etc/prosody/prosody.cfg.lua
-    echo 'http_upload_file_size_limit = 50000000' >> /etc/prosody/prosody.cfg.lua
+    echo 'http_upload_file_size_limit = 307200' >> /etc/prosody/prosody.cfg.lua
     echo '' >> /etc/prosody/prosody.cfg.lua
     echo "Component \"chat.${DEFAULT_DOMAIN_NAME}\" \"muc\"" >> /etc/prosody/prosody.cfg.lua
     echo '    name = "Chatrooms"' >> /etc/prosody/prosody.cfg.lua