minor: remove unused eclipse task

SVN: 10762

datastore_server/resource/eclipse/Dataset Download Service.launch

-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<launchConfiguration type="org.eclipse.jdt.launching.localJavaApplication">
-<listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_PATHS">
-<listEntry value="/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/server/DatasetDownloadService.java"/>
-</listAttribute>
-<listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_TYPES">
-<listEntry value="1"/>
-</listAttribute>
-<booleanAttribute key="org.eclipse.debug.core.appendEnvironmentVariables" value="true"/>
-<stringAttribute key="org.eclipse.jdt.launching.MAIN_TYPE" value="ch.systemsx.cisd.openbis.dss.generic.server.DatasetDownloadService"/>
-<stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="datastore_server"/>
-<stringAttribute key="org.eclipse.jdt.launching.VM_ARGUMENTS" value="-ea"/>
-</launchConfiguration>