test(sheets): drop redundant copyloopvar copy in required-flag parity test

Go 1.22+ scopes the loop var per iteration, so `cmd, business := cmd, business`
in TestBatchOp_RequiredFlagParity is a no-op that trips the repo's copyloopvar
linter (same cleanup as 2132472). Behavior unchanged; 45 sub-tests still pass.

shortcuts/sheets/batch_op_contract_test.go

@@ -878,7 +878,6 @@ func TestBatchOp_RequiredFlagParity(t *testing.T) {
 		if len(business) == 0 {
 			continue // only-locator commands (sheet-delete/hide/unhide/copy/filter-delete): nothing to omit
 		}
-		cmd, business := cmd, business
 		t.Run(cmd, func(t *testing.T) {
 			t.Parallel()
 			rawOp := map[string]interface{}{"shortcut": cmd, "input": sheetSel(cmd)}