Fix module name in `FindCed.cmake`

[abompard]

Without this change I'm getting:

-- Checking for module 'ced'
--   Package 'ced' not found
CMake Error at /usr/share/cmake-3.29/Modules/FindPkgConfig.cmake:619 (message):
  The following required packages were not found:

   - ced

Call Stack (most recent call first):
  /usr/share/cmake-3.29/Modules/FindPkgConfig.cmake:847 (_pkg_check_modules_internal)
  cmake/Modules/FindCed.cmake:16 (pkg_check_modules)
  game/CMakeLists.txt:138 (find_package)