engine: romaji is case-blind

Shift or Caps Lock made a Japanese key pass through as a Latin capital,
so nothing composed with Caps Lock on; Korean already folds case. Latin
text still has Ctrl+T.

strans.c

@@ -700,6 +700,8 @@ transition(u32int ks, u32int mod, Str *com)
 		return 0;
 	if(im.l->lang == LangKO)
 		ks = kokey(ks, mod);
+	else if(isjp(&im) && ks >= 'A' && ks <= 'Z')
+		ks += 'a' - 'A';	/* romaji is case-blind, Caps Lock included */
 	if(search.lang)
 		return searchkey(ks, mod, com);
 	n = movedelta(ks);