update SConscript build to reflect the mapper 253 move

src/boards/SConscript

@@ -24,6 +24,7 @@ my_list =  Split("""
 222.cpp
 23.cpp
 235.cpp
+253.cpp
 3d-block.cpp
 411120-c.cpp
 43.cpp

src/mappers/SConscript

@@ -1,5 +1,4 @@
 my_list =   Split("""
-253.cpp
 151.cpp
 16.cpp
 17.cpp