Pruning Bug Fix

[temaniarpit27]

Description

This PR fixes Pruning Bug introduced in v1.2.0

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (e0671d5) 55.93% compared to head (964494f) 55.97%.

Files	Patch %	Lines
eth/backend.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1110      +/-   ##
==========================================
+ Coverage   55.93%   55.97%   +0.03%     
==========================================
  Files         658      658              
  Lines      114435   114435              
==========================================
+ Hits        64012    64051      +39     
+ Misses      46574    46535      -39     
  Partials     3849     3849              

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[CroutonDigital]

Today I try run prune-state on my Polygon node use command (bot version 1.2.3):
bor snapshot prune-state --datadir /root/.bor/data/ --datadir.ancient=/root/.bor/data/bor/chaindata/ancient/

polygon-node-mainnet  | INFO [03-05|11:16:08.784] Using leveldb as the backing database 
polygon-node-mainnet  | INFO [03-05|11:16:08.785] Allocated cache and file handles         database=/root/.bor/data/bor/chaindata cache=1024.00MiB handles=524,288 compactionTableSize=0 compactionTableSizeMultiplier=0.000 compactionTotalSize=0 compactionTotalSizeMultiplier=0.000
polygon-node-mainnet  | INFO [03-05|11:16:29.842] Using LevelDB as the backing database 
polygon-node-mainnet  | INFO [03-05|11:16:29.842] Found legacy ancient chain path          location=/root/.bor/data/bor/chaindata/ancient/
polygon-node-mainnet  | INFO [03-05|11:16:29.978] Opened ancient database                  database=/root/.bor/data/bor/chaindata/ancient/ readonly=false
polygon-node-mainnet  | INFO [03-05|11:16:42.541] Initialized state bloom                  size=2.00GiB
polygon-node-mainnet  | ERROR[03-05|11:17:12.933] Failed to prune state                    err="no snapshot paired state"