DefautWelcomeService: just display text once

Was creating a display, which also shows the display, and then calling
display(welcomeText) on the created display. This would cause the
welcome text to show twice.

Author: hinerm

src/main/java/org/scijava/welcome/DefaultWelcomeService.java

@@ -36,7 +36,6 @@
 
 import org.scijava.app.AppService;
 import org.scijava.command.CommandService;
-import org.scijava.display.Display;
 import org.scijava.display.DisplayService;
 import org.scijava.event.EventHandler;
 import org.scijava.event.EventService;
@@ -90,8 +89,7 @@ public void displayWelcome() {
 		try {
 			if (welcomeFile.exists()) {
 				final String welcomeText = textService.asHTML(welcomeFile);
-				Display<?> display = displayService.createDisplay(welcomeText);
-				if (display != null) display.display(welcomeText);
+				displayService.createDisplay(welcomeText);
 			}
 		}
 		catch (final IOException e) {