Tweak platformio.ini alignment

platformio.ini

@@ -357,8 +357,8 @@ monitor_speed = 250000
 platform      = ststm32@>=5.7.0
 framework     = arduino
 board         = armed_v1
-build_flags =
+build_flags   = ${common.build_flags}
-  ${common.build_flags} -DUSBCON -DUSBD_VID=0x0483 '-DUSB_MANUFACTURER="Unknown"' '-DUSB_PRODUCT="ARMED_V1"' -DUSBD_USE_CDC
+  -DUSBCON -DUSBD_VID=0x0483 '-DUSB_MANUFACTURER="Unknown"' '-DUSB_PRODUCT="ARMED_V1"' -DUSBD_USE_CDC
   -O2 -ffreestanding -fsigned-char -fno-move-loop-invariants -fno-strict-aliasing -std=gnu11 -std=gnu++11
   -IMarlin/src/HAL/HAL_STM32
 lib_deps      = ${common.lib_deps}