IJPL-54591 Implement IDE theme sync with OS on Linux

- Enabling the feature


(cherry picked from commit 8c8d3935a0ec352ae2b3acdd73a32f7b4de1cb1d)

IJ-CR-192442

GitOrigin-RevId: 798adf901f64287701df7679e8f9606f5fff3197

Author: pporvatov

platform/platform-impl/src/com/intellij/ide/ui/laf/DBusSettingsMonitorService.kt

@@ -62,7 +62,7 @@ internal class DBusSettingsMonitorService(private val scope: CoroutineScope) {
   private var dbusMonitorProcess = AtomicReference<Process?>(null)
 
   val isServiceAllowed: Boolean
-    get() = SystemInfoRt.isLinux && System.getProperty("ide.linux.color.scheme.sync.support").toBoolean()
+    get() = SystemInfoRt.isLinux
 
   val darkScheme: StateFlow<Boolean?> = darkSchemeFlow.asStateFlow()