Fix DUE build in Travis CI

Followup to #10096

platformio.ini

@@ -77,18 +77,18 @@ src_filter  = ${common.default_src_filter}
 #  - RAMPS4DUE
 #  - RADDS
 #
-[env:DUE native port]
+[env:DUE]
 platform    = atmelsam
 framework   = arduino
-board       = dueUSB
+board       = due
 build_flags = ${common.build_flags}
 lib_deps    = ${common.lib_deps}
 lib_ignore  = c1921b4
 src_filter  = ${common.default_src_filter}
-[env:DUE programming port]
+[env:DUE_USB]
 platform    = atmelsam
 framework   = arduino
-board       = due
+board       = dueUSB
 build_flags = ${common.build_flags}
 lib_deps    = ${common.lib_deps}
 lib_ignore  = c1921b4