patch 8.1.1905: cannot set all properties of the info popup

Problem:    Cannot set all properties of the info popup.
Solution:   Add popup_findinfo().  Rename popup_getpreview() to
            popup_findpreview().
diff --git a/src/evalfunc.c b/src/evalfunc.c
index d2a0c64..62938c1 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -702,9 +702,10 @@
     {"popup_dialog",	2, 2, 0,	  f_popup_dialog},
     {"popup_filter_menu", 2, 2, 0,	  f_popup_filter_menu},
     {"popup_filter_yesno", 2, 2, 0,	  f_popup_filter_yesno},
+    {"popup_findinfo",	0, 0, 0,	  f_popup_findinfo},
+    {"popup_findpreview", 0, 0, 0,	  f_popup_findpreview},
     {"popup_getoptions", 1, 1, 0,	  f_popup_getoptions},
     {"popup_getpos",	1, 1, 0,	  f_popup_getpos},
-    {"popup_getpreview", 0, 0, 0,	  f_popup_getpreview},
     {"popup_hide",	1, 1, 0,	  f_popup_hide},
     {"popup_locate",	2, 2, 0,	  f_popup_locate},
     {"popup_menu",	2, 2, 0,	  f_popup_menu},