Enable compilerMetrics in webappcreator maven template.

Project created have compileReport enabled, but if compilerMetrics
is not enabled as well, links in html files are broken

Change-Id: I179d453739be3f507b1b05ec80751e4f84e945ea
diff --git a/user/src/com/google/gwt/user/tools/templates/maven/pom.xmlsrc b/user/src/com/google/gwt/user/tools/templates/maven/pom.xmlsrc
index 936d5a9..695e293 100644
--- a/user/src/com/google/gwt/user/tools/templates/maven/pom.xmlsrc
+++ b/user/src/com/google/gwt/user/tools/templates/maven/pom.xmlsrc
@@ -94,6 +94,7 @@
           <runTarget>@moduleShortName.html</runTarget>
           <!-- Ask GWT to create the Story of Your Compile (SOYC) (gwt:compile) -->
           <compileReport>true</compileReport>
+          <compilerMetrics>true</compilerMetrics>
           <!-- Run tests using HtmlUnit -->
           <mode>htmlunit</mode>
           <!-- Tests patterns -->