Add JSVG bundle 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. The
transitive dependency to the JSVG bundle has been missing and is added
by this change.

Author: HeikoKlare

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

@@ -391,4 +391,8 @@
          id="org.eclipse.swt.svg"
          version="0.0.0"/>
 
+   <plugin
+         id="com.github.weisj.jsvg"
+         version="0.0.0"/>
+
 </feature>