Update templateParser.php to parse Quote Discount in pdf

[IsmailHamdi]

Description

Motivation and Context

How To Test This

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)

Final checklist

• My code follows the code style of this project found here.
• My change requires a change to the documentation.
• I have read the How to Contribute guidelines.

[SuiteBot]

All committers have signed the CLA.

[IsmailHamdi]

All committers have signed the CLA.

Done

[serhiisamko091184]

Hello @IsmailHamdi,

thanks for contributing to the SuiteCRM project,

would you be so kind:

1. to be more specific and fill the template with replication steps and screenshots, if possible, or link this PR to the particular issue registered;

2. to update the commit message according to the format on the screenshot (if there is no specific issue to address, use the number of this PR - 10385):

More information to get acquainted: https://docs.suitecrm.com/community/contributing-code/bugs/

Many thanks in advance!

Regards,
Serhii