SUB-COMMAND "modify" cannot update the ready media

[szlt5]

When use the SUB-COMMAND to modify the printer "media" & "media-type" option, the webui setting value cannot be displayed synchronously.

Steps:

1. List the options by SUB-COMMAND "options"

  -o media=iso_a4_210x297mm (210x297mm or 8.3x12in) (default)
  -o media=na_letter_8.5x11in (8.5x11in or 215x279mm)
  ...
  -o media-source=Auto (default)
  -o media-source=by-pass-tray
  ...
  -o media-type=auto (default)
  -o media-type=stationery

2. Modify the "media-source", "media" and "media-type"

./legacy-printer-app modify -d fooA -o media-source=by-pass-tray -o media=na_letter_8.5x11in -o media-type=stationery

3. Listing the options again, "media-source", "media", and "media-type" have all been modified successfully.

-o media=na_letter_8.5x11in (8.5x11in or 215x279mm) (default)
-o media=iso_a4_210x297mm
...
-o media-source=by-pass-tray (default)
-o media-source=auto
...
-o media-type=stationery (default)
-o media-type=auto

4. Open webui http://localhost:8000, only the "media-source" is updated successfully, the "media" & "media-type" are not updated.