vim-patch:9.1.1889: filetype: not all AppleScript files are recognized (#36411)

Problem:  filetype: not all AppleScript files are recognized
Solution: Detect *.applescript files as applescript filetype
          (Samuel Huang)

Reference:
https://en.wikipedia.org/wiki/AppleScript

closes: vim/vim#18672

69dd5906fd

Co-authored-by: Samuel Huang <hi@sgh.ng>

runtime/lua/vim/filetype.lua

@@ -212,6 +212,7 @@ local extension = {
   aml = 'aml',
   run = 'ampl',
   g4 = 'antlr4',
+  applescript = 'applescript',
   scpt = 'applescript',
   ino = 'arduino',
   pde = 'arduino',