Remove manifest that no longer works for Kate version 20.12.1-1142 (#6227)

manifests/KDE/Kate/20.12.1-1142.yaml

@@ -1,18 +0,0 @@
-# Created using ManifestCreatorCore 1.0.0.0
-
-Name: Kate
-Publisher: KDE
-Id: KDE.Kate
-Version: 20.12.1-1142
-AppMoniker: kate
-License: LGPL-2.0
-Tags: kde, kate editor
-Description: Kate is a multi-document editor part of KDE since release 2.2. Being a KDE applications, Kate ships with network transparency, as well as integration with the outstanding features of KDE.
-Homepage: https://kate-editor.org/
-LicenseUrl: https://www.gnu.org/licenses/lgpl-3.0.html
-Installers:
-- Arch: x64
-  Url: https://binary-factory.kde.org/view/Windows%2064-bit/job/Kate_Release_win64/lastSuccessfulBuild/artifact/kate-20.12.1-1142-windows-msvc2019_64-cl-sideload.appx
-  Sha256: 5C985A0D343013811A9D8A519ED297C6491FCD117B99274FEE304B6D6747DBA2
-  InstallerType: appx
-ManifestVersion: 0.1.0