Fix EVA refuel for custom inventory propellants

[sdy623]

Fixes #415.

Summary

• Match stock-inventory resource snapshots against the active EVA propellant resource.
• Preserve the existing behavior for stock EVA Propellant while supporting configurations such as Kerbalism / Realism Overhaul using Nitrogen.

Cause

RefillEvaPack already obtains the active runtime PartResource from KerbalEVA.propellantResource, but the subsequent KSP 1.11+ inventory lookup ignores it and filters snapshots using StockResourceNames.EvaPropellant.

When the stored evaJetpack snapshot contains Nitrogen, the query returns no resources and KIS reports:

Unexpectedly no EVA resource parts found in: kerbalEVA

Change

Use the resource name from the active runtime propellant:

-.Where(x => x.resourceName == StockResourceNames.EvaPropellant)
+.Where(x => x.resourceName == propellantResource.resourceName)

This is intentionally limited to the target stock-inventory lookup. It does not change canister supply-resource handling or Kerbalism's boarding behavior.

Validation

• Confirmed the same hard-coded path in KIS 1.29 and current master.
• Confirmed an affected KSP 1.12.5 save stores Nitrogen under ModuleInventoryPart / STOREDPART (evaJetpack) / RESOURCE, rather than as a matching resource directly on kerbalEVA.
• Compiled the patched KIS source successfully against the installed KSP 1.12.5 assemblies (local build-only target: .NET Framework 4.8; no project-file changes are included in this PR).
• Verified the branch is one commit ahead of master and changes one line in one file.
• Full in-game verification is still pending.

Related issue

#360 made the canister's source resource configurable. This change covers the remaining hard-coded target-resource lookup in the stock-inventory path.