fix: Host Agent toggle visual state not updating after click

The toggle button in Alerts > Thresholds > Host Agents was working
functionally (alerts were actually disabled) but the visual state wasn't
updating. This was because the hostAgentsWithOverrides memo was missing
the 'disabled' field in its returned Resource objects.

Related to #893

frontend-modern/src/components/Alerts/ThresholdsTable.tsx

@@ -810,6 +810,7 @@ export function ThresholdsTable(props: ThresholdsTableProps) {
           hasCustomThresholds ||
           Boolean(override?.disabled) ||
           Boolean(override?.disableConnectivity),
+        disabled: override?.disabled || false,
         disableConnectivity: override?.disableConnectivity || false,
         thresholds: override?.thresholds || {},
         defaults: props.hostDefaults,
@@ -831,6 +832,7 @@ export function ThresholdsTable(props: ThresholdsTableProps) {
           instance: '',
           status: 'unknown',
           hasOverride: true,
+          disabled: override.disabled || false,
           disableConnectivity: override.disableConnectivity || false,
           thresholds: override.thresholds || {},
           defaults: props.hostDefaults,