* gnu/packages/kde.scm (kuserfeedback): Update to 1.3.0.
[native-inputs]: Use qttools replace qttools-5.
[inputs]: Remove qtbase-5 and qtcharts. Use qtdeclarative and qtsvg replace qtdeclarative-5
and qtsvg-5.
[arguments]: Set #:qtbase to qtbase.
<#:configure-flags>: Add -DQT_MAJOR_VERSION=6.
Change-Id: I4c96ef879aa7e8241809cdfcbff9c613e3c8812d