Fix a bootlock condition if/when loader_logo is set in loader.conf(5)

NB: This deeply effected HardenedBSD which had a default value set.

Embarassingly, I allowed the `type' primitive to be passed -1/-1 for
c-addr/u stack input (the effect of which is to pull INT_MAX bytes
from character address negative one in which hilarity ensues over a
black screen in full-on bootlock). Much thanks to Shawn Webb [lattera]
for helping me diagnose.

NB: The mode-ending revisions were initially suspected (and reverted)
but proved to be a red-herring. Proper mode endings will be returning.

Thanks to:	lattera (@HardenedBSD [<dot><com>])
Reported by:	lattera
MFC after:	3 days
X-MFC-to:	stable/10

sys/boot/forth/version.4th

@@ -85,10 +85,12 @@ only forth definitions also version-processing
 	dup versionX @ swap - versionY @ at-xy
 
 	\ Print the version (optionally in cyan)
-	loader_color? dup ( -- bool bool )
+	loader_color? dup ( c-addr/u -- c-addr/u bool bool )
 	if 6 fg then
-	type
+	-rot type
 	if 7 fg then
+
+	0 25 at-xy
 ;
 
 only forth definitions