Fix default value of quasselweb https

LSIO quassel-web container checks that QUASSEL_WEB env var has non-zero
length, not explicit `true` or `false` values. The default value of this
env var was incorrectly set to `false` when adding sipport for it to
DockSTARTer.

compose/.apps/quasselweb/quasselweb.labels.yml

@@ -9,7 +9,7 @@ services:
       com.dockstarter.appvars.quasselweb_port_64080: "64080"
       com.dockstarter.appvars.quasselweb_port_64443: "64443"
       com.dockstarter.appvars.quasselweb_quassel_core: "quasselcore"
-      com.dockstarter.appvars.quasselweb_quassel_https: "false"
+      com.dockstarter.appvars.quasselweb_quassel_https: ""
       com.dockstarter.appvars.quasselweb_quassel_port: "4242"
       com.dockstarter.appvars.quasselweb_restart: "unless-stopped"
       com.dockstarter.appvars.quasselweb_tag: "latest"