Fix module requirement names

gfx/element.lua

@@ -1,4 +1,4 @@
-local Event = require("event")
+local Event = require("gfx.event")
 
 local Element = {
   x = 1,

gfx/list.lua

@@ -1,4 +1,4 @@
-local Element = require("element")
+local Element = require("gfx.element")
 local List = Element:new{
   children = {},
   vertical = false

gfx/padding.lua

@@ -1,5 +1,5 @@
-local Event = require("event")
-local Element = require("element")
+local Event = require("gfx.event")
+local Element = require("gfx.element")
 local Padding = Element:new{
     left = 0,
     right = 0,

gfx/text.lua

@@ -1,4 +1,4 @@
-local Element = require("element")
+local Element = require("gfx.element")
 local Text = Element:new{ text = "" }
 
 function Text:new(o)