Update OpenHABCore/Sources/OpenHABCore/Util/Preferences.swift

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: DigiH <17110652+DigiH@users.noreply.github.com>

Author: DigiH

OpenHABCore/Sources/OpenHABCore/Util/Preferences.swift

@@ -200,9 +200,6 @@ public actor Preferences {
     @UserDefault("idleOff", defaultValue: false)
     public var idleOff: Bool
 
-    @UserDefault("showSearchField", defaultValue: true)
-    public var showSearchField: Bool
-
     @UserDefault("screensaverEnabled", defaultValue: false)
     public var screensaverEnabled: Bool