Update flow.py in delete_intermediate_files to fix the if statement a…

[HazemAlindari]

…nd delete SystemVerilog temp files

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Types of changes

• Bug fix (change which fixes an issue)
• New feature (change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

[vaughnbetz]

Thanks. Will merge when CI finishes.

[vaughnbetz]

if refactoring is the same functionality but easier to read, and the new code removes .sv files as well. Will merge after CI finishes.