Fix: Enable touch-to-backlight on T-Echo (not just T-Echo Plus) (#9953)

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The touch-to-backlight feature was gated behind TTGO_T_ECHO_PLUS, but
the regular T-Echo has the same backlight pin (PIN_EINK_EN, P1.11).
This changes the guard to use PIN_EINK_EN only, so any device with an
e-ink backlight pin gets the feature.

Fixes #7630

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

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