build KMyMoney with QWebEngine instead of QWegKit

[peterzay]

This request comes from KMM dev.

For the whole story, see here:

https://bugs.kde.org/show_bug.cgi?id=453640

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: kmymoney (not installed)
ProcVersionSignature: Ubuntu 5.15.0-58.64-generic 5.15.74
Uname: Linux 5.15.0-58-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Feb 6 20:17:52 2023
InstallationDate: Installed on 2022-04-22 (290 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kmymoney
UpgradeStatus: No upgrade log present (probably fresh install)

[peterzay (peterzay)]

Please change QWegKit to QWebKit.