fix(secret-tool): fix empty candidates for "secret-tool search" options

In the completion of `secret-tool', the option names `--all' and
`--unlock' are stored as the keys of the associative array `opts' but
not as the values.  In addition, the test had been wrongly requested
not to produce any completion results for "secret-tool search ".  Now
we have the proper expected result of the test.

Author: akinomyoga

completions/secret-tool

@@ -41,7 +41,7 @@ _secret_tool()
             for word in "${words[@]:2}"; do
                 [[ $word ]] && unset opts["$word"]
             done
-            COMPREPLY=($(compgen -W '${opts[@]}' -- "$cur"))
+            COMPREPLY=($(compgen -W '${!opts[@]}' -- "$cur"))
             ;;
     esac
 } &&

test/t/test_secret_tool.py

@@ -9,4 +9,4 @@ def test_modes(self, completion):
 
     @pytest.mark.complete("secret-tool search ")
     def test_no_complete(self, completion):
-        assert not completion
+        assert completion == ["--all", "--unlock"]