Remove reference to obsolete code

Kaushik Ghose · Kaushik Ghose · commit 02484ce84899 · 2019-05-21T08:31:40.000-04:00
diff --git a/MANIFEST.in b/MANIFEST.in
@@ -1,2 +1 @@
-include benten/gui/benten-icon.png
 recursive-include benten/000.package.data *

Original file line number	Diff line number	Diff line change
`@@ -1,2 +1 @@`
`1`		`-include benten/gui/benten-icon.png`
`2`	`1`	`recursive-include benten/000.package.data *`