filedlg.c: don't refresh file list if filter unchanged; update filter in any case

[Patrick]

ChangeLog:

dlls/comdlg32/filedlg.c:

 - Don't refresh file list in the file dialog if filter unchanged
 - Update the file list if file filter combobox changed in any way
(CBN_SELCHANGE), such as scroll-wheel or mouse click.

- Pat Rick
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