Fixes broken theme installation

Author: maxkratz

packages/theme-packages.list

@@ -1,5 +1,2 @@
 com.genuitec.eclipse.theming.core.feature.feature.group
 com.genuitec.eclipse.theming.dependencies.feature.feature.group
-com.genuitec.eclipse.theming.designer.feature.feature.group
-com.genuitec.eclipse.theming.feature.feature.group
-com.genuitec.eclipse.theming.oss.feature.group