Remove obsolete kservicetypes file

plugins/CMakeLists.txt

 add_definitions(-DTRANSLATION_DOMAIN=\"kdeconnect-plugins\")
-install(FILES kdeconnect_plugin.desktop DESTINATION ${SERVICETYPES_INSTALL_DIR})
 
 add_subdirectory(ping)
 add_subdirectory(battery)

plugins/kdeconnect_plugin.desktop

-[Desktop Entry]
-Type=ServiceType
-X-KDE-ServiceType=KdeConnect/Plugin
-X-KDE-Derived=KPluginInfo
-Name=KDEConnect Plugin
-Name[ar]=ملحقة KDEConnect
-Name[ast]=Plugin KDEConnect
-Name[az]=KDEConnect Qoşması
-Name[bg]=Приставка на KDEConnect
-Name[bs]=Priključak za KDE konekciju
-Name[ca]=Connector del KDE Connect
-Name[ca@valencia]=Connector del KDE Connect
-Name[cs]=Modul KDEConnect
-Name[da]=KDEConnect-plugin
-Name[de]=KDEConnect-Modul
-Name[el]=Πρόσθετο του KDEConnect
-Name[en_GB]=KDEConnect Plugin
-Name[es]=Complemento de KDEConnect
-Name[et]=KDEConnecti plugin
-Name[eu]=KDEConnect plugina
-Name[fi]=KDE Connect -liitännäinen
-Name[fr]=Module externe KDEConnect
-Name[gl]=Complemento de KDE Connect
-Name[he]=תוספי KDEConnect
-Name[hu]=KDEConnect bővítmény
-Name[id]=Plugin KDEConnect
-Name[it]=Estensione KDEConnect
-Name[ko]=KDE Connect 플러그인
-Name[lt]=KDEConnect papildinys
-Name[nl]=Plug-in van KDEConnect
-Name[nn]=KDEConnect-tillegg
-Name[pl]=Wtyczka KDEConnect
-Name[pt]='Plugin' do KDEConnect
-Name[pt_BR]=Plugin do KDEConnect
-Name[ro]=Extensie KDEConnect
-Name[ru]=Модуль KDE Connect
-Name[sk]=Zásuvný modul aplikácie KDEConnect
-Name[sl]=Vtičnik KDE Connect
-Name[sr]=КДЕ‑конекцијин прикључак
-Name[sr@ijekavian]=КДЕ‑конекцијин прикључак
-Name[sr@ijekavianlatin]=KDE‑konekcijin priključak
-Name[sr@latin]=KDE‑konekcijin priključak
-Name[sv]=KDE anslutningsinsticksprogram
-Name[tr]=KDEConnect Eklentisi
-Name[uk]=Додаток KDEConnect
-Name[x-test]=xxKDEConnect Pluginxx
-Name[zh_CN]=KDEConnect 插件
-Name[zh_TW]=KDE 連線外掛程式
-
-# mandatory, list of all the package types supported
-[PropertyDef::X-KdeConnect-SupportedPackageType]
-Type=QStringList
-
-[PropertyDef::X-KdeConnect-OutgoingPackageType]
-Type=QStringList