OZG-6179 tiny code improvement

nachrichten-manager-server/src/main/java/de/ozgcloud/nachrichten/antragraum/TrustLevel.java

@@ -21,7 +21,7 @@ enum TrustLevel {
 	}
 
 	private int extractIntValue() {
-		return Integer.parseInt(value.substring(value.length() - 1, value.length()));
+		return Integer.parseInt(value.substring(value.length() - 1));
 	}
 
 	public static TrustLevel fromString(String value) {