Typo from the dawn of time: toybox is not capitalized the way BusyBox was.

It's just a word. Capitalize at the start of the sentence, otherwise don't.
Yeah, it could be always capitalized as a proper name but since the command
"toybox" is all lower case, that would be weird.
diff --git a/Config.in b/Config.in
index de6a2c5..c546fc4 100644
--- a/Config.in
+++ b/Config.in
@@ -1,4 +1,4 @@
-mainmenu "ToyBox Configuration"
+mainmenu "Toybox Configuration"
 
 
 source generated/Config.probed