remove slf4j from feature.xml in update

Author: dietzc

org.knime.scijava.update/feature.xml

@@ -24,13 +24,6 @@
          version="0.0.0"
          unpack="false"/>
 
-   <plugin
-         id="scijava-log-slf4j"
-         download-size="0"
-         install-size="0"
-         version="0.0.0"
-         unpack="false"/>
-
    <plugin
          id="scijava-plugins-text-plain"
          download-size="0"