Revert "fixup! sparse-checkout: fix OOM error with mixed patterns"

This reverts commit d33146878e, which
will not be needed with the updated version of another topic that
the test was having trouble with.

t/t1091-sparse-checkout-builtin.sh

@@ -117,7 +117,7 @@ test_expect_success 'switching to cone mode with non-cone mode patterns' '
 		cd bad-patterns &&
 		git sparse-checkout init &&
 		git sparse-checkout add dir &&
-		git config --worktree core.sparseCheckoutCone true &&
+		git config core.sparseCheckoutCone true &&
 		test_must_fail git sparse-checkout add dir 2>err &&
 		grep "existing sparse-checkout patterns do not use cone mode" err
 	)