Fix T1000-E button helper polarity

[robekl]

Summary

• make T1000eBoard::buttonStateChanged() respect USER_BTN_PRESSED
• align the board helper with the T1000-E build flags and UI code
• keep the change limited to the stale helper implementation

Issue

The T1000-E board definition already declares the user button as active-high in:

• variants/t1000-e/platformio.ini
  • -D USER_BTN_PRESSED=HIGH

But T1000eBoard::buttonStateChanged() still hardcodes LOW as the pressed state.

That leaves the board helper out of sync with the actual board configuration. Even if most T1000-E UI paths currently use the generic button abstraction instead of this helper, keeping the helper inverted is still a maintenance trap for any code that uses the board class directly.

Fix

This change:

• adds the same USER_BTN_PRESSED fallback used elsewhere in the UI code
• replaces the hardcoded LOW comparison in buttonStateChanged() with USER_BTN_PRESSED

Why this fixes it

It makes the board helper follow the same polarity source as the rest of the T1000-E build. That keeps the T1000-E board abstraction internally consistent and avoids future regressions where direct board-button callers would interpret presses backwards.

Validation

• pio run -e t1000e_companion_radio_ble