Add icons for some menu options in KMail
Summary:
In KMail, the following menu options did not have icons:
- Settings -> Add Accounts (Main window)
- Settings -> Configure Filters (Main window)
- Go -> Jump to Folder (Main window)
- Tools -> Spellchecker (Compose window)
This commit adds relevant icons for these.
Reviewers: KDE PIM: KMail, dvratil
Reviewed By: dvratil
Subscribers: dvratil, kde-pim
Tags: KDE PIM
Differential Revision: https://phabricator.kde.org/D28063