Minimig: unload FDD upon config loading.

menu.cpp

@@ -2077,6 +2077,7 @@ void HandleUI(void)
 				if (df[menusub].status & DSK_INSERTED) // eject selected floppy
 				{
 					df[menusub].status = 0;
+					FileClose(&df[menusub].file);
 					menustate = MENU_MAIN1;
 				}
 				else

minimig_config.cpp

@@ -422,6 +422,12 @@ unsigned char LoadConfiguration(int num)
 		updatekickstart = true;
 		BootPrintEx(">>> No config found. Using defaults. <<<");
 	}
+
+	for (int i = 0; i < 4; i++)
+	{
+		df[i].status = 0;
+		FileClose(&df[i].file);
+	}
 
 	// print config to boot screen
 	char cfg_str[256];