ics download description field includes html entities

[rch77]

Context

1. PHP Version: <!-- php -v --!> 8.2.11

2. Package version: 1.8.5

Describe the Bug

Google calendar expects details (description) field to be html, while ics download tries to convert the same to plain text using strip_tags() php function. It leaves html entities like   showing in the plain text. It should use html_entity_decode() in addition to strip_tags().

Expected Behavior

Do not see   in ics description output.

DESCRIPTION: with plain text
X-ALT-DESC;FMTTYPE=text/HTML: with html