ui : manage colors and ensure fw using ssd1306 still compile

variants/rak4631/platformio.ini

@@ -34,7 +34,7 @@ build_flags =
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
 build_src_filter = ${rak4631.build_src_filter}
-  +<helpers/ui/*.cpp>
+  +<helpers/ui/SSD1306Display.cpp>
   +<../examples/simple_repeater>
 
 [env:RAK_4631_room_server]
@@ -50,7 +50,7 @@ build_flags =
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
 build_src_filter = ${rak4631.build_src_filter}
-  +<helpers/ui/*.cpp>
+  +<helpers/ui/SSD1306Display.cpp>
   +<../examples/simple_room_server>
 
 [env:RAK_4631_companion_radio_usb]
@@ -65,7 +65,7 @@ build_flags =
 ; NOTE: DO NOT ENABLE -->  -D MESH_PACKET_LOGGING=1
 ; NOTE: DO NOT ENABLE -->  -D MESH_DEBUG=1
 build_src_filter = ${rak4631.build_src_filter}
-  +<helpers/ui/*.cpp>
+  +<helpers/ui/SSD1306Display.cpp>
   +<../examples/companion_radio>
 lib_deps =
   ${rak4631.lib_deps}
@@ -85,7 +85,7 @@ build_flags =
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
 build_src_filter = ${rak4631.build_src_filter}
-  +<helpers/ui/*.cpp>
+  +<helpers/ui/SSD1306Display.cpp>
   +<helpers/nrf52/*.cpp>
   +<../examples/companion_radio>
 lib_deps =