Upgrades visualizer showing nonzero change in % savings for baseline

[whiphi92]

Issue overview

When using the upgrades_visualizer tool's percent savings function, sometimes we see that baseline has a nonzero percent savings change. This should always be 0%

Current Behavior

Example screenshot:

Expected Behavior

Baseline should be 0%

Steps to Reproduce

Use main branch of buildstock-query.

Use default options_saturations.csv file.

Athena workgroup name: eulp

Database name: eussrr2

Table name: medium_run_20240129

Include monthly plots? No

Show all upgrades.

Context

Can cause confusion during QC.