fix: Properly provide instance id

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/Service/InitialStateService.php

@@ -53,7 +53,7 @@ public function provideCapabilities(): void {
 		$this->initialState->provideInitialState('productName', $this->capabilitiesService->getProductName());
 		$this->initialState->provideInitialState('hasDrawSupport', $this->capabilitiesService->hasDrawSupport());
 		$this->initialState->provideInitialState('hasNextcloudBranding', $this->capabilitiesService->hasNextcloudBranding());
-		$this->initialState->provideInitialState('instanceid', $this->config->getSystemValue('instanceid'));
+		$this->initialState->provideInitialState('instanceId', $this->config->getSystemValue('instanceid'));
 
 		$this->provideOptions();