patch 9.1.0603: filetype: use correct extension for Dracula

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>