Minor fix on https://github.com/XENONnT/fuse/pull/363

[dachengx]

Before you submit this PR: make sure to put all XENONnT specific information in a wiki-note as the repo is publicly accessible

What does the code in this PR do / what does it improve?

Can you briefly describe how it works?

Can you give a minimal working example (or illustrate with a figure)?

Please include the following if applicable:

• Update the docstring(s)
• Bump plugin version(s)
• Update the documentation
• Tests to check the (new) code is working as desired.
• Does it solve one of the GitHub open issues?

[coveralls]

Pull Request Test Coverage Report for Build 20588624970

Details

• 0 of 3 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 72.469%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
fuse/plugins/processing/corrected_areas.py	0	3	0.0%

Totals
Change from base Build 20564847620:	0.0%
Covered Lines:	2656
Relevant Lines:	3665

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💛 - Coveralls