Remove redefinition of variable in same scope (#391)

src/courtroom.cpp

@@ -839,7 +839,7 @@ void Courtroom::set_widgets()
   ui_pre->setToolTip(
       tr("Play a single-shot animation as defined by the emote when checked."));
 
-  pos_size_type design_ini_result =
+  design_ini_result =
     ao_app->get_element_dimensions("immediate", "courtroom_design.ini");
 
   // If we don't have new-style naming, fall back to the old method