Extension check matches using TimelineItem.GetName() instead of source media filepath

[in03]

The extension check should not use TimelineItem.GetName(). Although the default clip name is the file name of the source media, a user can give something a custom clip name, and then the script will fail to find the clip's extension in acceptable_exts. Since it's a basic string "in" check, no attempt is made to confirm the filepath exists. TBH, I'm not entirely sure if we need an extension check? By "trying" .GetClipProperty(), anything that doesn't have that method will fail. If that method fails, then we also can't retrieve the "File Path" attribute. If we just go off the "File Path" attribute from the start, we know we're receiving a real file path from Resolve and that the name is up to date.

[in03]

Removed file extension check, trusting try block will filter well enough:

try:
        media_item = item.GetMediaPoolItem()
        attributes = media_item.GetClipProperty()
        all_clips.append(attributes)

except:
        continue