[shellintegration] Simplify cmake code

We don't need ECM to check for KIO

Signed-off-by: Nicolas Fella <nicolas.fella@gmx.de>

shell_integration/CMakeLists.txt

@@ -11,10 +11,8 @@ if( UNIX AND NOT APPLE )
   endif()
 
   if(BUILD_SHELL_INTEGRATION_DOLPHIN)
-    find_package(ECM 1.2.0 NO_MODULE QUIET)
-    set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
-    find_package(KF5 "5.16" COMPONENTS KIO)
-    if(KF5_FOUND)
+    find_package(KF5KIO "5.16")
+    if(KF5KIO_FOUND)
       add_subdirectory(dolphin)
     else()
       message("Dolphin plugin disabled: KDE Frameworks 5.16 not found")