fix(lightning): tune scorer params

[pwltr]

Description

Improves Lightning route selection by tuning node-wide scorer fee params. These params have been used in nightly probing testing as the next variant. See comparison to current (stable) here.

iOS counterpart: synonymdev/bitkit-ios#639

[greptile-apps]

Greptile Summary

The PR tunes Lightning route scoring parameters:

• Reduces the node-wide base penalty from 50,000 msat to 40,000 msat.
• Removes the 60,000 msat probing-diversity override, causing the existing default value of zero to be retained.

Confidence Score: 5/5

The PR appears safe to merge with no actionable defects identified.

The changes consistently apply the intended scorer tuning through the existing node-builder configuration, and no broken contract or reachable failure is established.

Important Files Changed

Filename	Overview
app/src/main/java/to/bitkit/services/LightningService.kt	Updates two scorer fee parameters used when configuring the Lightning node; no concrete correctness issue was identified.

_{Reviews (1): Last reviewed commit: "fix(lightning): tune scorer params" | Re-trigger Greptile}

[piotr-iohk]

LGTM, given probing nightly results.