That was one of my creations. No need for a patch, the icon can be hidden by adding a one line statement in /usr/share/applications/sailfish-tutorial.desktop
Add the following text;
NoDisplay=true
Add the new line as shown below;
[Desktop Entry]
Type=Application
NoDisplay=true <--- here is a good place
Name=Tutorial
X-MeeGo-Logical-Id=tutorial-ap-name
X-MeeGo-Translation-Catalog=tutorial
Icon=icon-launcher-tutorial
Exec=invoker -s --type=silica-qt5 /usr/bin/sailfish-tutorial
Comment=Sailfish tutorial
Name[en_US]=sailfish-tutorial
X-Desktop-File-Install-Version=0.26
[X-Sailjail]
Sandboxing=Disabled
Save and watch the icon remove itself from the launcher.