Fix MfciPolicy.py syntax error

[MarcChen46]

Description

Fix a syntax error in MfciPolicy.py while using pyinstaller to generate executable file.

For details on how to complete these options and their meaning refer to CONTRIBUTING.md.

• Impacts functionality?
• Impacts security?
• Breaking change?
• Includes tests?
• Includes documentation?

How This Was Tested

Verified the MfciPolicy.exe can be generated by pyinstaller successfully.
Verified the system info can be dumped as below

Integration Instructions

N/A

[MarcChen46]

@apop5 @kuqin12

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 11.40%. Comparing base (5ce0d6a) to head (4c17aae).

Additional details and impacted files

@@             Coverage Diff             @@
##           dev/202405     #606   +/-   ##
===========================================
  Coverage       11.40%   11.40%           
===========================================
  Files             145      145           
  Lines           21915    21915           
  Branches         2546     2546           
===========================================
  Hits             2499     2499           
  Misses          19382    19382           
  Partials           34       34           

Flag	Coverage Δ
MfciPkg	39.37% <ø> (ø)

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