Remove unused type variable

This merge request removes an unused type variable in SampleDispatcher.java. This caused warnings when the Java lib is compiled with -Xlint since the LabComm compiler outputs code that doesn't use the type variable.

lib/java/se/lth/control/labcomm/SampleDispatcher.java

package se.lth.control.labcomm;
-public interface SampleDispatcher <T> {
+public interface SampleDispatcher {
public Class getSampleClass();