[BUG] file input type does not handle the accept filter correctly

[MarcWeustink]

There are several issues with the accept filter:

1. <input class="sdpi-item-value" id="select_1" type="file" accept=".jpg">
   Expected: a file choose dialog with a filter: supported formats = *.jpg
   Result: a file choose dialog with no filter

2. <input class="sdpi-item-value" id="select_1" type="file" accept=".jpg,.svg">
   Expected: a file choose dialog with a filter: supported formats = *.jpg *.svg
   Result: a file choose dialog with a filter: supported formats = *.jpg *.jpeg *.jpe *.svg

3. <input class="sdpi-item-value" id="select_1" type="file" accept=".jpg,.jpeg">
   Expected: a file choose dialog with a filter: supported formats = *.jpg *.jpeg
   Result: a file choose dialog with a filter: supported formats = *.jpg *.jpeg *.jpe *.jpg *.jpeg *.jpe

4. <input class="sdpi-item-value" id="select_1" type="file" accept=".jpg,.foo">
   Expected: a file choose dialog with a filter: supported formats = *.jpg *.foo
   Result: a file choose dialog with a filter: supported formats = *.jpg *.jpeg *.jpe

I ran into this since I wanted to add the ability to select our own custom image format.
Thanks, Marc

OS: Win11
SD version: 6.4.1.19697