[dia] zoom: change ZOOM_FIT define

[Zander Brown <zbrown src gnome org>]

commit 305d15c4e14da41890cc03e803742cd408f43efa
Author: Erelwar <erelwar gmail com>
Date:   Mon Jun 22 13:49:47 2020 +0000

    zoom: change ZOOM_FIT define
    
    Apparently fix https://gitlab.gnome.org/GNOME/dia/-/issues/444, not
    totally sure why....

 app/menus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/app/menus.c b/app/menus.c
index 938b69e63..34721c87c 100644
--- a/app/menus.c
+++ b/app/menus.c
@@ -275,7 +275,7 @@ static const GtkRadioActionEntry display_select_radio_entries[] =
   { "SelectInverse", NULL, N_("In_verse"), NULL, NULL, SELECT_INVERT }
 };
 
-#define ZOOM_FIT -1
+#define ZOOM_FIT -1.0
 
 enum {
   COL_DISPLAY,