Fix button glitches in widescreen UI (#125)

In widescreen strategic UI, team panel sort buttons would be hidden when transferring items to and fro merc inventory via CTRL + left click
Exit inventory panel button should always be disabled in widescreen UI

Strategic/Map Screen Interface Bottom.cpp

@@ -1292,7 +1292,7 @@ void EnableDisableBottomButtonsAndRegions( void )
 		{
 			DisableButton( giMapInvDoneButton );
 		}
-		else
+		else if (!isWidescreenUI())
 		{
 			EnableButton( giMapInvDoneButton );
 		}

Strategic/mapscreen.cpp

@@ -5708,7 +5708,7 @@ UINT32 MapScreenHandle(void)
 		HandleCharBarRender( );
 	}
 
-	if( fShowInventoryFlag || fDisableDueToBattleRoster )
+	if( (fShowInventoryFlag && !isWidescreenUI()) || fDisableDueToBattleRoster )
 	{
 		for( iCounter = 0; iCounter < MAX_SORT_METHODS; iCounter++ )
 		{
@@ -17968,4 +17968,4 @@ void initMapViewAndBorderCoordinates(void)
 		UI_MAP.HeliETA.Upper_Popup_Y = (50 + iScreenHeightOffset - 100);
 		UI_MAP.HeliETA.Alternate_Height = 97;
 	}
-}
+}