sensecap_solar: Fixing LED definitions

[Confituurke]

Summary

Corrects the LED pin definitions for the SenseCap Solar P1 to match the actual hardware. The blue LoRa TX LED was incorrectly named green in the code, and the user LED is white (not blue).

Problem

• User LED (D11) – White LED on pin 11 was defined as LED_GREEN on pin 12
• LoRa TX LED (D12) – Blue LED on pin 12 was defined as LED_BLUE on pin 11

Changes

• LED_GREEN (12) → LED_WHITE (11) – User LED on D11
• LED_BLUE (11) → LED_BLUE (12) – LoRa TX indicator on D12

Hardware mapping

Pin	Function	Define
D11 (P0.15)	User LED (white)	LED_WHITE
D12 (P0.19)	LoRa TX / breathing LED (blue)	LED_BLUE

[Confituurke]

@liamcottle @recrof
Could you check and eventually approve this PR, this fixes LED assignment and naming in the code.
PINs where wrongly assigned/swapped. + Green LED is in fact a White LED. The actual Green LED on the SenseCAP Solar cannot be used via a PIN and is used to indicate the battery state.

Thank you in advance.