runtime(vim): Update base-syntax, match :loadkeymap after colon and bar

Match :loadkeymap after Ex colons and bars.

Don't generate :loadkeymap as it is matched with a custom syntax group.

closes: #15554

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/testdir/input/vim9_ex_commands.vim

@@ -293,7 +293,7 @@ vim9script
 :lnfile
 :lNfile
 :lnoremap
-:loadkeymap
+# :loadkeymap # disabled - runs until EOF
 :loadview
 :lockmarks
 :lockvar
@@ -880,7 +880,7 @@ Foo() | lNext
 Foo() | lnfile
 Foo() | lNfile
 Foo() | lnoremap
-Foo() | loadkeymap
+# Foo() | loadkeymap # disabled - runs until EOF
 Foo() | loadview
 Foo() | lockmarks
 Foo() | lockvar

runtime/syntax/testdir/input/vim9_ex_loadkeymap.vim

@@ -1,6 +1,6 @@
 vim9script
 
-# Vim Keymap file for syntax testing
+# Vim :loadkeymap command
 
 scriptencoding utf-8
 

runtime/syntax/testdir/input/vim_ex_commands.vim

@@ -289,7 +289,7 @@
 :lnewer
 :lnfile
 :lnoremap
-:loadkeymap
+" :loadkeymap " disabled - runs until EOF
 :loadview
 :lockmarks
 :lockvar
@@ -877,7 +877,7 @@ call Foo() | lnext
 call Foo() | lnewer
 call Foo() | lnfile
 call Foo() | lnoremap
-call Foo() | loadkeymap
+" call Foo() | loadkeymap " disabled - runs until EOF
 call Foo() | loadview
 call Foo() | lockmarks
 call Foo() | lockvar

runtime/syntax/testdir/input/vim_ex_loadkeymap.vim

@@ -1,4 +1,4 @@
-" Vim Keymap file for syntax testing
+" Vim :loadkeymap command
 
 scriptencoding utf-8
 

runtime/syntax/testdir/input/vim_ex_loadkeymap_after_bar.vim

@@ -0,0 +1,10 @@
+" Vim :loadkeymap command (after "|")
+
+scriptencoding utf-8
+
+let b:keymap_name = "syntax-test"
+
+echo "..." | loadkeymap
+
+a A    Basic mapping
+

runtime/syntax/testdir/input/vim_ex_loadkeymap_after_colon.vim

@@ -0,0 +1,10 @@
+" Vim :loadkeymap command (after ":")
+
+scriptencoding utf-8
+
+let b:keymap_name = "syntax-test"
+
+:loadkeymap
+
+a A    Basic mapping
+