moved gwt.version into existing <properties> tag (duplicate tag warning otherwise)

java/pom.xml

@@ -10,10 +10,6 @@
     <version>1.0.0-SNAPSHOT</version>
   </parent>
 
-  <properties>
-      <gwt.version>2.6.1</gwt.version>
-  </properties>
-
 	<artifactId>root</artifactId>
 	<packaging>pom</packaging>
 
@@ -125,7 +121,7 @@
 	
 	<properties>
 		<tycho-version>0.21.0</tycho-version>
-        
+       		<gwt.version>2.6.1</gwt.version> 
 		<!--
           QUESTION: Which properties or settings are system dependent and differ across
                     different machines/environments?