patch 8.2.1540: the user cannot try out emoji character widths

Problem:    The user cannot try out emoji character widths.
Solution:   Move the emoji script to the runtime/tools directory.
diff --git a/src/testdir/emoji_list.vim b/src/testdir/emoji_list.vim
deleted file mode 100644
index e6a73c3..0000000
--- a/src/testdir/emoji_list.vim
+++ /dev/null
@@ -1,22 +0,0 @@
-" Script to fill the window with emoji characters, one per line.
-
-if &modified
-  new
-else
-  enew
-endif
-
-" Use a compiled Vim9 function for speed
-def DoIt()
-  let lnum = 1
-  for c in range(0x100, 0x1ffff)
-    let cs = nr2char(c)
-    if charclass(cs) == 3
-      setline(lnum, '|' .. cs .. '| ' .. strwidth(cs))
-      lnum += 1
-    endif
-  endfor
-enddef
-
-call DoIt()
-set nomodified
diff --git a/src/version.c b/src/version.c
index ba308cd..cd341e2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1540,
+/**/
     1539,
 /**/
     1538,