52441: zle_vi: Mark variables with const init as const

Because these variables are initialized with as constant string, they should
be marked as *const* to make the compiler running with `-Wwrite-strings`
more happy.

ChangeLog

@@ -1,5 +1,7 @@
 2024-01-28  Oliver Kiddle  <opk@zsh.org>
 
+	* Jörg Sommer: 52441: Src/Zle/zle_vi.c: Mark variables as const
+
 	* Jörg Sommer: 52440: Src/Zle/textobjects.c: Mark variables as const
 
 2024-01-26  Oliver Kiddle  <opk@zsh.org>

Src/Zle/zle_vi.c

@@ -1014,7 +1014,7 @@ int
 visetbuffer(char **args)
 {
     ZLE_INT_T ch;
-    ZLE_CHAR_T *match = ZWS("_*+");
+    const ZLE_CHAR_T *match = ZWS("_*+");
     int registermod[] = { MOD_NULL, MOD_PRI, MOD_CLIP };
     ZLE_CHAR_T *found;