Remove duplicate rows.

Author: Quency-D

variants/heltec_vision_master_e290/platformio.ini

@@ -23,7 +23,6 @@ build_flags =
   -D Vision_Master_E290
 build_src_filter = ${esp32_base.build_src_filter}
   +<../variants/heltec_vision_master_e290>    
-  +<helpers/ui/MomentaryButton.cpp>
 lib_deps =
   ${esp32_base.lib_deps}
   https://github.com/Quency-D/heltec-eink-modules/archive/563dd41fd850a1bc3039b8723da4f3a20fe1c800.zip