Simplification: only use special-case token retrieval logic when magic trailing comma is present

src/black/__init__.py

@@ -6632,7 +6632,7 @@ def can_omit_invisible_parens(
 
     penultimate = line.leaves[-2]
     last = line.leaves[-1]
-    if line.should_split or line.magic_trailing_comma:
+    if line.magic_trailing_comma:
         try:
             penultimate, last = last_two_except(line.leaves, omit=omit_on_explode)
         except LookupError: