trim trailing / from ancient path

[simonecid]

Description

Fix a bug that leads to node corruption when --datadir.ancient has a trailing /.

To reproduce:

/usr/bin/bor snapshot prune-block --datadir=/var/lib/polygon/bor/ --datadir.ancient=/var/lib/polygon/bor/bor/chaindata/ancient/

Behaviour:

• bor saves ancient_back to /var/lib/polygon/bor/bor/chaindata/ancient/ancient_back because of filepath.Split at line 485
• folder ancient is deleted after pruning, removing ancient_back
• -> node is corrupted

Fix: use TrimSuffix to remove the trailing / is present.

Changes

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Changes only for a subset of nodes