Prevent pending toggle to get reset

[f2cmb]

Description

• It fixes GLPI 11 : pending feature cleared when applying a follow-up template without a pending reason #21164
• Here is a brief description of what this PR does :

Root Cause:
The JavaScript function itilfollowuptemplate_update() was unconditionally clearing the pending status when applying a followup template without a pending reason. Two issues:

1. Line 304-305 always set checked = (data.pendingreasons_id > 0), unchecking the pending when template had no pending defined
2. Lines 316-326 actively cleared user's pending choices if template didn't define a pending reason

Fix:
Removed the automatic clearing logic. Now the code only applies pending fields if the template explicitly defines them (data.pendingreasons_id > 0). If the template has no pending
defined, user's choices are preserved (do nothing).

[f2cmb]

I can see that the TinyMCE content is cleared when choosing a template. So still WIP.

[f2cmb]

Fixed content clearing : if the followup template has no content in it, TinyMCE is not cleared (l.289 - 291), assuming the user would add his own content w/o an "empty" template.

[AdrienClairembault]

Looks good but I guess the same should be done on task templates then?

[AdrienClairembault]

See previous comment

[cedric-anne]

Please check if the same fix must be applied to task form.