Fix TabErrors for inconsistent indentation in lalapps.cosmicstring
Description
This MR fixes syntax errors in lalapps.cosmicstring (TabError: inconsistent use of tabs and spaces in indentation (cosmicstring.py, line 309))
/cc @kipp.cannon, @daichi.tsuna, @steffen.grunewald
API Changes and Justification
Backwards Compatible Changes
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This change introduces no API changes -
This change adds new API calls
Backwards Incompatible Changes
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This change modifies an existing API -
This change removes an existing API