fix bug while geocoding complex wrapped interferogram

[comma-never-coma]

Description of proposed changes
There is something wrong while geocoding a wrapped interferograms in complex type due to ComplexWarning. The change would fix it as below.#955

Reminders

• Fix problems in geocoding wrapped interferograms in complex type #955
• Pass Pre-commit check (green)
• Pass Codacy code review (green)
• Pass Circle CI test (green)
• If modifying functionality, describe changes to function behavior and arguments in a comment below the function declaration.

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[yunjunz]

LGTM, thank you @comma-never-coma!

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