Update DynamicThemeServiceInitListener.java

Author: javier-godoy

src/main/java/com/flowingcode/vaadin/addons/demo/DynamicThemeServiceInitListener.java

@@ -28,7 +28,7 @@ public void serviceInit(ServiceInitEvent event) {
           props.load(in);
           String themeName = props.getProperty("theme");
           if (themeName != null) {
-            DynamicTheme theme = DynamicTheme.valueOf(themeName.toUpperCase());
+            DynamicTheme theme = DynamicTheme.valueOf(themeName.toUpperCase().trim());
             event.addIndexHtmlRequestListener(theme::initialize);
           }
         }
@@ -38,4 +38,4 @@ public void serviceInit(ServiceInitEvent event) {
     }
   }
 
-}
+}