skeleton: Remove extra ending in build.properties

Remove the extra trailing comma+continuation line ending in core's
build.properties file. Make the latter consistent with its siblings that
way too.

Change-Id: Ic0566547bfd3134b1eb2495892d18f492b139cd3
Signed-off-by: Marco Miller <marco.miller@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/182627
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
diff --git a/skeleton/skeleton.core/build.properties b/skeleton/skeleton.core/build.properties
index ecf6dc3..6f75a19 100644
--- a/skeleton/skeleton.core/build.properties
+++ b/skeleton/skeleton.core/build.properties
@@ -14,4 +14,4 @@
 bin.includes = META-INF/,\
                .,\
                about.html,\
-               plugin.properties,\
+               plugin.properties