fix: Unable to upload to remote

[pfeerick]

When using pio remote, it appears this code remanent was preventing upload (to a d1_mini target), triggering an "Error: Could not find LD script" error to be shown.

It seems it should have been fixed in e69a2cb but resurfaced at a later date.

Fixes platformio/platformio-core#3580

[QrackEE]

Experiencing it as of today

• PlatformIO Core 6.1.18,
• platformio/espressif8266 4.2.1

Hotfixed thanks to @optiprime post in platformio-core/issues/3580 (linked to this)

here's my mod, with 'minimal change to stay on the safe side (hopefully... did not dig into full impact of this..)

> sed -n '262,270 p' platforms/espressif8266/builder/main.py
# remove after PIO Core 3.6 release
#elif set(["checkprogsize", "upload"]) & set(COMMAND_LINE_TARGETS):
elif set(["checkprogsize"]) & set(COMMAND_LINE_TARGETS):
    _update_max_upload_size(env)

wouldn't that be time to fulfill this 'todo', or is it still necessary despite prior hopes? @ivankravets, do you happen to remember? Answer could help push merge of related PR by @pfeerick.