Better variable for archive suffix

[albertteoh]

Signed-off-by: albertteoh albert.teoh@logz.io

Short description of the changes

• Fix variable name from Prefix to the more appropriate Suffix

[codecov]

Codecov Report

Merging #2854 (8a4b6d0) into master (c01aa2b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2854   +/-   ##
=======================================
  Coverage   95.92%   95.92%           
=======================================
  Files         222      222           
  Lines        9696     9696           
=======================================
  Hits         9301     9301           
- Misses        325      327    +2     
+ Partials       70       68    -2     

Impacted Files	Coverage Δ
plugin/storage/es/spanstore/reader.go	100.00% <100.00%> (ø)
pkg/config/tlscfg/cert_watcher.go	92.20% <0.00%> (-2.60%)	⬇️
...lugin/sampling/strategystore/adaptive/processor.go	99.07% <0.00%> (-0.93%)	⬇️
plugin/storage/badger/spanstore/reader.go	96.08% <0.00%> (+0.71%)	⬆️
cmd/query/app/server.go	97.08% <0.00%> (+1.45%)	⬆️

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