Add SWT SVG fragment to SDK tests feature

The SVG fragment needs to be available in SDK tests product as SWT tests
require that fragment and the SDK does not currently not include it.

Author: HeikoKlare

eclipse.platform.releng/features/org.eclipse.sdk.tests/feature.xml

@@ -387,4 +387,8 @@
          id="org.eclipse.update.configurator.tests"
          version="0.0.0"/>
 
+   <plugin
+         id="org.eclipse.swt.svg"
+         version="0.0.0"/>
+
 </feature>