Move LFS_NO_ASSERT to nrf52.ini

variants/t-echo/platformio.ini

@@ -17,7 +17,7 @@ build_flags = ${nrf52840_base.build_flags} -Ivariants/t-echo
   -DEINK_LIMIT_RATE_RESPONSIVE_SEC=1   ; Minimum interval between RESPONSIVE updates
   -DEINK_LIMIT_GHOSTING_PX=2000        ; (Optional) How much image ghosting is tolerated
   -DEINK_BACKGROUND_USES_FAST          ; (Optional) Use FAST refresh for both BACKGROUND and RESPONSIVE, until a limit is reached.
-  -DLFS_NO_ASSERT                      ; Disable LFS assertions
+
 build_src_filter = ${nrf52_base.build_src_filter} +<../variants/t-echo>
 lib_deps = 
   ${nrf52840_base.lib_deps}