Apply suggestion from @kevinjqliu

Author: kevinjqliu

pyiceberg/expressions/visitors.py

@@ -1905,12 +1905,7 @@ def visit_starts_with(self, term: BoundTerm, literal: LiteralValue) -> BooleanEx
             return AlwaysFalse()
 
     def visit_not_starts_with(self, term: BoundTerm, literal: LiteralValue) -> BooleanExpression:
-        starts_with_result = self.visit_starts_with(term, literal)
-        # Should return opposite of visit_starts_with
-        if isinstance(starts_with_result, AlwaysTrue):
-            return AlwaysFalse()
-        else:
-            return AlwaysTrue()
+        return ~self.visit_starts_with(term, literal)
 
     def visit_bound_predicate(self, predicate: BoundPredicate) -> BooleanExpression:
         """