Incorrect root path for export of profileicon by id

[Robert Lyon]

We sometimes get this error when doing an HTML (or PDF) export

   * log_message("Undefined property: HtmlExportOutputFilter::$rootd...", 8, true, true, "/home/robertl/code/mahara-devel/mahara/htdocs/expo...", 1652)
   * error(8, "Undefined property: HtmlExportOutputFilter::$rootd...", "/home/robertl/code/mahara-devel/mahara/htdocs/expo...", 1652, array(size 9))
   * HtmlExportOutputFilter->replace_thumbnail_link(array(size 4))

To test:
Create a person and add a profile icon to the person
Create a page and add comment to the page
Export the person

Expected result
 In report bar the message - Export generated successfully.

Actual result
 In report bar the message - Export generated with some errors.

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/c/mahara/+/13541
Committed: https://git.mahara.org/mahara/mahara/commit/e92e6d172df04b02aa4e2daf7ee4e4fc2e9f8513
Submitter: "Robert Lyon <email address hidden>"
Branch: 22.04_DEV

commit e92e6d172df04b02aa4e2daf7ee4e4fc2e9f8513
Author: Robert Lyon <email address hidden>
Date: Mon Dec 5 13:06:09 2022 +1300

Bug 1998725: Correcting path to profile icon in HTML export

The rootdir value was not fetched correctly

Change-Id: I817af27606a94c4edfb3966cf93b85d12b041b60
Signed-off-by: Robert Lyon <email address hidden>

[Mahara Bot (dev-mahara)]

Patch for "21.10_DEV" branch: https://reviews.mahara.org/c/mahara/+/13542

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/c/mahara/+/13542
Committed: https://git.mahara.org/mahara/mahara/commit/71c8e78b45c4be05476844d8388712c22f897041
Submitter: "Robert Lyon <email address hidden>"
Branch: 21.10_DEV

commit 71c8e78b45c4be05476844d8388712c22f897041
Author: Robert Lyon <email address hidden>
Date: Mon Dec 5 13:06:09 2022 +1300

Bug 1998725: Correcting path to profile icon in HTML export

The rootdir value was not fetched correctly

Change-Id: I817af27606a94c4edfb3966cf93b85d12b041b60
Signed-off-by: Robert Lyon <email address hidden>