fix: Corrects ability to disable all blocking from the CLI by not providing any groups

[BenMcH]

This PR fixes #1336 and restores the v0.22 behavior of calling blocky blocking disable without any additional arguments. It appears that in #1129, we lost the following check from api_endpoints.go, lines 123-126:

	groupsParam := req.URL.Query().Get("groups")
	if len(groupsParam) > 0 {
		groups = strings.Split(groupsParam, ",")
	}

This parsing, being done by hand, allowed us to receive a query string, groups= and implicitly drop this variable. This PR adds this check back in

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9f633f1) 93.97% compared to head (cee6075) 93.97%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1373   +/-   ##
=======================================
  Coverage   93.97%   93.97%           
=======================================
  Files          78       78           
  Lines        6361     6361           
=======================================
  Hits         5978     5978           
  Misses        294      294           
  Partials       89       89           

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[ThinkChaos]

Thanks for looking into it and finding the root cause!