Added support for Windows 32 bit

[hql287]

Description

Updated electron-builder config to export Windows installer that supports 32 bit arch

Related Issue

Issue #185

Motivation and Context

Some users still running Windows with 32-bit arch and previous releases of Manta did not support this architecture.

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

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

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have included a migration scheme (If type of change is breaking change)