Constant with quote in DSPF

[Gaia-Florian]

Describe the bug
When you have a quote in a constant, renderer doesn't display correctly.

To Reproduce
Add constant with a quote.

Without a quote it's ok

Environment (please complete the following information):

• Extension version [e.g. 2.17.0]
• IBM i OS version [e.g. 7.6]