pkginfo: Use AppStream's function for formatting flatpak

descriptions.

This avoids an extra dependency also.

debian/control

@@ -15,7 +15,6 @@ Depends: python3,
          gir1.2-xapp-1.0,
          gir1.2-appstream-1.0,
          gir1.2-xmlb-2.0,
-         html2text,
          mint-translations,
          libgtk3-perl
          ${misc:Depends},

usr/lib/python3/dist-packages/mintcommon/installer/pkgInfo.py

@@ -1,4 +1,3 @@
-import html2text
 import sys
 if sys.version_info.major < 3:
     raise "python3 required"
@@ -373,7 +372,11 @@ def get_description(self, as_component=None):
             description = as_component.get_description()
 
             if description is not None:
-                self.description = html2text.html2text(description)
+                try:
+                    self.description = AppStream.markup_convert(description, AppStream.MarkupKind.TEXT)
+                except GLib.Error as e:
+                    warn("Could not convert description to text: %s" % e.message)
+                    self.description = description
 
         if self.description is None:
             return ""