Remove explicit disabled icons from org.eclipse.ant.ui bundle

Use on-the-fly-generated disabled version of SVG-rasterized icons
instead.

Author: HeikoKlare

ant/org.eclipse.ant.ui/plugin.xml

@@ -708,7 +708,6 @@ M4 = Platform-specific fourth key -->
   				toolbarPath="org.eclipse.ui.edit.text.actionSet.presentation/Presentation" 
   				id="org.eclipse.ant.ui.toggleMarkOccurrences" 
   				definitionId="org.eclipse.ant.ui.toggleMarkOccurrences"
-  				disabledIcon="$nl$/icons/full/dtool16/mark_occurrences.png" 
   				icon="$nl$/icons/full/etool16/mark_occurrences.svg" 
   				label="%toggleMarkOccurrences.label" 
   				retarget="true" 
@@ -717,7 +716,6 @@ M4 = Platform-specific fourth key -->
   				style="toggle" 
   				toolbarPath="org.eclipse.ui.edit.text.actionSet.presentation/Presentation" 
   				id="org.eclipse.ant.ui.toggleAutoReconcile"
-  				disabledIcon="$nl$/icons/full/dlcl16/refresh.png" 
   				icon="$nl$/icons/full/elcl16/refresh.svg" 
   				label="%toggleAutoReconcile.label" 
   				retarget="true"