runtime(termdebug): Fix saved_mousemodel check

Commit: 
https://github.com/vim/vim/commit/477402ecf99b09087c2517398f05e02f082ef192
Author: laburnumT <laburnum...@gmail.com>
Date:   Sun Jun 9 18:38:14 2024 +0200

    runtime(termdebug): Fix saved_mousemodel check
    
    Fix issue introduced by 23f29ffc64276dd790581f98b86a0a6435b7eb22 where
    saved_mousemodel is introduced as a variable, so the exists check will
    always be true.
    
    Move to check the value of saved_mousemodel instead.
    
    closes: #14946
    
    Signed-off-by: laburnumT <laburnum...@gmail.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim 
b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
index d083b7ec9..26c266598 100644
--- a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
+++ b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
@@ -1220,7 +1220,7 @@ def DeleteCommands()
     win_gotoid(curwinid)
     winbar_winids = []
 
-    if exists('saved_mousemodel')
+    if saved_mousemodel != ''
       &mousemodel = saved_mousemodel
       saved_mousemodel = null_string
       try

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