[gedit] docs: Remove another unused outdated screenshot

[Andre Klapper <aklapper src gnome org>]

commit d9b05510bed2876a3a9edf123f89caa85f9567c0
Author: Andre Klapper <a9016009 gmx de>
Date:   Fri Sep 15 10:12:58 2017 +0200

    docs: Remove another unused outdated screenshot

 help/C/figures/gedit-side-pane3.png |  Bin 2866 -> 0 bytes
 help/Makefile.am                    |    3 +--
 2 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/help/Makefile.am b/help/Makefile.am
index bf2e3bc..be7f65d 100644
--- a/help/Makefile.am
+++ b/help/Makefile.am
@@ -6,8 +6,7 @@ HELP_ID = gedit
 HELP_MEDIA = \
        figures/gedit-html-snippet.png \
        figures/gedit-icon.png \
-       figures/gedit3-screenshot.png \
-       figures/gedit-side-pane3.png
+       figures/gedit3-screenshot.png
 
 HELP_FILES = \
        gedit-change-color-scheme.page \