cc-avatar-chooser.c: Enable remote file selection
Currently user can choose avatar only from local files.
This prevents users from loading a file at a remote location.
Changes made include:
- Setting local-only property to false in
cc_avatar_chooser_select_file
- Getting file uri and creating a GFile from it.
- Reading the GFile into an input stream.
- Loading image from this stream.
Closes: #813 (closed)