add quickdelete option; closes #183

togglebutton in the ui switches between 2 (off/default) and
1 (on/quick) confirmations; global-option `--qdel` sets the default

setting `--qdel=0` changes the togglebutton to switch
between 1 (off/default) confirmations and 0 (on)

in other words, when the ui-button is enabled, it
always reduces the number of confirmations by one

copyparty/authsrv.py

@@ -2670,6 +2670,7 @@ class AuthSrv(object):
                 "def_hcols": list(vf.get("mth") or []),
                 "unlist0": vf.get("unlist") or "",
                 "see_dots": self.args.see_dots,
+                "dqdel": self.args.qdel,
                 "dgrid": "grid" in vf,
                 "dgsel": "gsel" in vf,
                 "dnsort": "nsort" in vf,