Remove 2 unused entries from debian/source/include-binaries.
Certainty: certain
Fixed-Lintian-Issues:
 source: unused-entry-in-debian-source-include-binaries debian/gone2.png [debian/source/include-binaries:3]
 source: unused-entry-in-debian-source-include-binaries debian/gone1.png [debian/source/include-binaries:1]
