Remove obsolete files (cursor.png, cursor-bin.desktop.in, cursor-bin.sh)

These files are no longer used by the current PKGBUILD which now uses
the .deb package format and extracts resources directly from it.

cursor-bin.desktop.in

@@ -1,11 +0,0 @@
-[Desktop Entry]
-Name=Cursor
-Exec=/usr/bin/cursor --no-sandbox %U
-Terminal=false
-Type=Application
-Icon=cursor
-# Change the class below to "Cursor" when on X11
-StartupWMClass=cursor
-X-AppImage-Version=@@PKGVERSION@@
-MimeType=x-scheme-handler/cursor;
-Categories=Utility;TextEditor;Development;IDE

cursor-bin.sh

@@ -1,11 +0,0 @@
-#!/bin/bash
-
-XDG_CONFIG_HOME=${XDG_CONFIG_HOME:-~/.config}
-
-# Allow users to override command-line options
-if [[ -f $XDG_CONFIG_HOME/cursor-flags.conf ]]; then
-  CURSOR_USER_FLAGS="$(sed 's/#.*//' $XDG_CONFIG_HOME/cursor-flags.conf | tr '\n' ' ')"
-fi
-
-# Launch
-exec /opt/cursor-bin/cursor-bin.AppImage "$@" $CURSOR_USER_FLAGS