refactor: reduce redundant function declarations

lua/lz/n/handler/colorscheme.lua

@@ -18,10 +18,7 @@ function M.lookup(name)
     return state.lookup_plugin(name)
 end
 
----@param name string
-function M.del(name)
-    state.del(name)
-end
+M.del = state.del
 
 ---@param name string
 local function on_colorscheme(name)

lua/lz/n/handler/event.lua

@@ -176,9 +176,6 @@ function M.add(plugin)
     end)
 end
 
----@param name string
-function M.del(name)
-    state.del(name)
-end
+M.del = state.del
 
 return M

lua/lz/n/handler/keys.lua

@@ -150,9 +150,6 @@ function M.add(plugin)
     end)
 end
 
----@param name string
-function M.del(name)
-    state.del(name)
-end
+M.del = state.del
 
 return M