Update ftintitle.contains_feat unit tests

Since the `for_artist` keyword has been removed from
`ftintitle.contains_feat`, the unit tests need to be updated.
This includes the deletion of the test cases that test the
`for_artist=True` delimiters.

test/plugins/test_ftintitle.py

@@ -175,31 +175,20 @@ def test_split_on_feat(self):
         parts = ftintitle.split_on_feat("Alice defeat Bob")
         assert parts == ("Alice defeat Bob", None)
 
-    def test_contains_feat_artist(self):
+    def test_contains_feat(self):
         assert ftintitle.contains_feat("Alice ft. Bob")
         assert ftintitle.contains_feat("Alice feat. Bob")
         assert ftintitle.contains_feat("Alice feat Bob")
         assert ftintitle.contains_feat("Alice featuring Bob")
-        assert ftintitle.contains_feat("Alice & Bob")
-        assert ftintitle.contains_feat("Alice and Bob")
-        assert ftintitle.contains_feat("Alice With Bob")
         assert ftintitle.contains_feat("Alice (ft. Bob)")
         assert ftintitle.contains_feat("Alice (feat. Bob)")
         assert ftintitle.contains_feat("Alice [ft. Bob]")
         assert ftintitle.contains_feat("Alice [feat. Bob]")
         assert not ftintitle.contains_feat("Alice defeat Bob")
         assert not ftintitle.contains_feat("Aliceft.Bob")
         assert not ftintitle.contains_feat("Alice (defeat Bob)")
-
-    def test_contains_feat_title(self):
-        assert ftintitle.contains_feat(
-            "Live and Let Go (feat. Alice)", for_artist=False
-        )
-        assert ftintitle.contains_feat(
-            "Live and Let Go [feat. Alice]", for_artist=False
-        )
-        assert ftintitle.contains_feat(
-            "Live and Let Go feat. Alice", for_artist=False
-        )
-        assert not ftintitle.contains_feat("Live and Let Go", for_artist=False)
-        assert not ftintitle.contains_feat("Come With Me", for_artist=False)
+        assert ftintitle.contains_feat("Live and Let Go (feat. Alice)")
+        assert ftintitle.contains_feat("Live and Let Go [feat. Alice]")
+        assert ftintitle.contains_feat("Live and Let Go feat. Alice")
+        assert not ftintitle.contains_feat("Live and Let Go")
+        assert not ftintitle.contains_feat("Come With Me")