StripLocation: Remove all PNG extra info to make sure that GPS data is gone.

lib/pleroma/upload/filter/exiftool/strip_location.ex

@@ -16,7 +16,9 @@ defmodule Pleroma.Upload.Filter.Exiftool.StripLocation do
 
   def filter(%Pleroma.Upload{tempfile: file, content_type: "image" <> _}) do
     try do
-      case System.cmd("exiftool", ["-overwrite_original", "-gps:all=", file], parallelism: true) do
+      case System.cmd("exiftool", ["-overwrite_original", "-gps:all=", "-png:all=", file],
+             parallelism: true
+           ) do
         {_response, 0} -> {:ok, :filtered}
         {error, 1} -> {:error, error}
       end