patch 9.1.0603: filetype: use correct extension for Dracula

Problem:  pattern detection for Dracula language uses "*lvs" and "*lpe".
          as there is no dot, those are not treated as extensions which
          they should (judging by 'runtime/syntax/dracula.vim' and
          common sense).
Solution: use "*.lvs" and "*.lpe" patterns (Evgeni Chasnovski)

closes: #15303

Signed-off-by: Evgeni Chasnovski <evgeni.chasnovski@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    603,
 /**/
     602,
 /**/