Forever events have limited count

[amirping]

Describe the bug
Create an event with forever selected ends up having a limited number of counts '1000' added to the PRULE value.
we have this issue on all our production servers with version 5.2.0, as a quick fix w increased the value count in jqxschedular.api.js@882 to 100000.

To Reproduce
Steps to reproduce the behavior:

1. Create an event with End set to "never"
2. check the output ics
3. PRULE of the event have COUNT=1000 next to the UNTIL rule.

Expected behavior
Event with end set to "never" must not have COUNT rule

Screenshots

Desktop (please complete the following information):

• OS: debian 10
• Browser: chrome
• Version: 93.0.4577.63 (Official Build) (64-bit)

Additional context

[amirping]

The issue related to ics export function