package/Config.in: move flutter-pi

flutter-pi was erroneously placed under the "Graphic libraries" section
of the menu "Graphic libraries and applications (graphic/text)" menu.
However, as flutter-pi is an application that runs graphic applicaitons
it is better suited to be placed under the "Graphic applications"
section.

Signed-off-by: Adam Duskett <adam.duskett@amarulasolutions.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 1a2ae469d0c9d548c091f731748e01039dd4f2a4)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/Config.in

@@ -313,6 +313,7 @@ menu "Graphic libraries and applications (graphic/text)"
 comment "Graphic applications"
 	source "package/cage/Config.in"
 	source "package/cog/Config.in"
+	source "package/flutter-pi/Config.in"
 	source "package/fswebcam/Config.in"
 	source "package/ghostscript/Config.in"
 	source "package/glmark2/Config.in"
@@ -346,7 +347,6 @@ comment "Graphic libraries"
 	source "package/fbterm/Config.in"
 	source "package/fbv/Config.in"
 	source "package/flutter-gallery/Config.in"
-	source "package/flutter-pi/Config.in"
 	source "package/freerdp/Config.in"
 	source "package/graphicsmagick/Config.in"
 	source "package/imagemagick/Config.in"