Made more .stkgui name correspond to the c++ file name.

src/states_screens/edit_gp_screen.cpp

@@ -35,7 +35,7 @@ using namespace GUIEngine;
 DEFINE_SCREEN_SINGLETON( EditGPScreen );
 
 // -----------------------------------------------------------------------------
-EditGPScreen::EditGPScreen() : Screen("gpedit.stkgui"), m_gp(NULL),
+EditGPScreen::EditGPScreen() : Screen("edit_gp.stkgui"), m_gp(NULL),
               m_list(NULL), m_icon_bank(NULL),
               m_selected(-1), m_modified(false)
 {

src/states_screens/grand_prix_editor_screen.cpp

@@ -40,8 +40,9 @@ DEFINE_SCREEN_SINGLETON( GrandPrixEditorScreen );
 
 
 // -----------------------------------------------------------------------------
-GrandPrixEditorScreen::GrandPrixEditorScreen()
-    : Screen("gpeditor.stkgui"), m_selection(NULL), m_gpgroup(GrandPrixData::GP_NONE)
+GrandPrixEditorScreen::GrandPrixEditorScreen() 
+                     : Screen("grand_prix_editor.stkgui"), m_selection(NULL),
+                       m_gpgroup(GrandPrixData::GP_NONE)
 {
 }