fix(scaleform): invalid private property access

Adds an isDrawing and draw method to scaleforms.
So technically a feature I guess.

imports/scaleform/client.lua

@@ -153,15 +153,11 @@ function lib.scaleform:setRenderTarget(name, model)
     end
 end
 
----@return nil
+function lib.scaleform:isDrawing()
-function lib.scaleform:startDrawing()
+    return self.private.isDrawing
-    if self.private.isDrawing then
+end
-        return
-    end
 
-    self.private.isDrawing = true
+function lib.scaleform:draw()
-    CreateThread(function()
-        while self.private.isDrawing do
     if self.target then
         SetTextRenderId(self.target)
         SetScriptGfxDrawOrder(4)
@@ -182,7 +178,18 @@ function lib.scaleform:startDrawing()
     if self.target then
         SetTextRenderId(1)
     end
+end
 
+function lib.scaleform:startDrawing()
+    if self.private.isDrawing then
+        return
+    end
+
+    self.private.isDrawing = true
+
+    CreateThread(function()
+        while self:isDrawing() do
+            self:draw()
             Wait(0)
         end
     end)