Enable "Capture screenshot" command in command palette (react#243)

Remove the `canDock` condition gate from the `emulation.capture-screenshot` action, allowing it to appear in the RN DevTools command palette. The other screenshot variants (full-size, node) remain gated behind `canDock`.

Author: huntie

front_end/panels/emulation/emulation-meta.ts

@@ -103,7 +103,6 @@ UI.ActionRegistration.registerActionExtension({
     const Emulation = await loadEmulationModule();
     return new Emulation.DeviceModeWrapper.ActionDelegate();
   },
-  condition: Root.Runtime.conditions.canDock,
   title: i18nLazyString(UIStrings.captureScreenshot),
 });