r300g: remove the CS compenstation for non-atomized states

Now there aren't any. If CS overflow occurs, the fix should go directly
before the problematic BEGIN_CS.

src/gallium/drivers/r300/r300_emit.c

@@ -1207,9 +1207,6 @@ unsigned r300_get_num_dirty_dwords(struct r300_context *r300)
         }
     }
 
-    /* XXX This is the compensation for the non-atomized states. */
-    dwords += 1024;
-
     return dwords;
 }