fix(cw): Icom CI-V CW works over the network backend too

The CI-V keyer is the same 0x17 command on the same IcomController whatever
carries the link; only the warnings and enable checks insisted on the USB
backend, telling a network operator their working keyer would fail.

frontend/src/components/SettingsModal.tsx

@@ -4893,7 +4893,7 @@ function SettingsModalImpl({ onClose, onSaved, initialSection, onMainPaneChanged
 
           {wk.engine === 'icom' ? (
             <>
-              {(!catCfg.enabled || catCfg.backend !== 'icom') && (
+              {(!catCfg.enabled || (catCfg.backend !== 'icom' && catCfg.backend !== 'icom-net')) && (
                 <p className="text-xs font-medium text-warning -mt-1 flex items-start gap-1.5">
                   <span aria-hidden>⚠</span>
                   <span>{t('wk.catWarnIcom', { backend: catCfg.enabled ? (catCfg.backend || 'none') : 'disabled' })}</span>