Fix DisableLoggingFeature in Narayana JTA

The log level we get in beforeAnalysis may be null, in which case we
still want to reset it after analysis.

From the javadoc of Logger#getLevel:

> Get the log Level that has been specified for this Logger.
> The result may be null, which means that this logger's effective level will be inherited from its parent.

(cherry picked from commit d5c2ed5)

extensions/narayana-jta/runtime/src/main/java/io/quarkus/narayana/jta/runtime/graal/DisableLoggingFeature.java

@@ -31,10 +31,8 @@ public void beforeAnalysis(BeforeAnalysisAccess access) {
     public void afterAnalysis(AfterAnalysisAccess access) {
         for (String category : CATEGORIES) {
             Level level = categoryMap.remove(category);
-            if (level != null) {
-                Logger logger = Logger.getLogger(category);
-                logger.setLevel(level);
-            }
+            Logger logger = Logger.getLogger(category);
+            logger.setLevel(level);
         }
     }