torrentz2: amendment to 9a071a3457

using title: without a query string causes 0 results which meant the
jackett dashboard TEST button failed.
now we only add title: if a query was supplied.

src/Jackett.Common/Definitions/torrentz2.yml

@@ -69,11 +69,8 @@
     paths:
       - path: "{{if .Config.filter-verified }}verified{{else}}searchA{{end}}"
     inputs:
-       f: "{{ .Keywords }}"
+       f: "{{if .Keywords }}title: {{else}}{{end}}{{ .Keywords }}"
        safe: "{{if .Config.filter-safe }}1{{else}}0{{end}}"
-    keywordsfilters:
-      - name: prepend
-        args: "title: " # search only in title, https://torrentz2.eu/help
     rows:
       selector: "html body #wrap .results dl:has(a)"
     # andmatch filter removed, see #3737