lua: use core log level names

When the Lua code was written, the core didn't have names for log levels
yet (just numbers). The only user visible change is that "verbose"
becomes "v", since this level had different names.

player/lua.c

@@ -258,20 +258,11 @@ static void kill_script(struct script_ctx *ctx)
     talloc_free(ctx);
 }
 
-static const char *log_level[] = {
-    [MSGL_FATAL] = "fatal",
-    [MSGL_ERR] = "error",
-    [MSGL_WARN] = "warn",
-    [MSGL_INFO] = "info",
-    [MSGL_V] = "verbose",
-    [MSGL_DEBUG] = "debug",
-};
-
 static int check_loglevel(lua_State *L, int arg)
 {
     const char *level = luaL_checkstring(L, arg);
-    for (int n = 0; n < MP_ARRAY_SIZE(log_level); n++) {
-        if (log_level[n] && strcasecmp(log_level[n], level) == 0)
+    for (int n = 0; n < MSGL_MAX; n++) {
+        if (mp_log_levels[n] && strcasecmp(mp_log_levels[n], level) == 0)
             return n;
     }
     luaL_error(L, "Invalid log level '%s'", level);

player/lua/defaults.lua

@@ -70,7 +70,7 @@ mp.msg = {
     error = function(...) return mp.log("error", ...) end,
     warn = function(...) return mp.log("warn", ...) end,
     info = function(...) return mp.log("info", ...) end,
-    verbose = function(...) return mp.log("verbose", ...) end,
+    verbose = function(...) return mp.log("v", ...) end,
     debug = function(...) return mp.log("debug", ...) end,
 }