only apply DPI if we were able to get a value. use the display and screen
* src/vtefc.c(_vte_fc_defaults_from_rdb): only apply DPI if we were able to get a value. * src/vterdb.c, src/vterdb.h: use the display and screen of a passed-in widget if asked to do so, else use screen 0 of the default display.
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