Invert entity invis check to reduce indentation level

Instead of doing

    if (!obj.entities[i].invis)
    {
        ...
    }

It's better to do

    if (obj.entities[i].invis)
    {
        continue;
    }

    ...

It reduces the indentation by one level, which is always a good thing.

desktop_version/src/Graphics.cpp

@@ -1422,8 +1422,11 @@ void Graphics::drawentities()
 
     for (int i = obj.entities.size() - 1; i >= 0; i--)
     {
-        if (!obj.entities[i].invis)
+        if (obj.entities[i].invis)
         {
+            continue;
+        }
+
         if (obj.entities[i].size == 0)
         {
             // Sprites
@@ -1676,7 +1679,6 @@ void Graphics::drawentities()
 
 
 
-            }
         }
     }
 }