samples: wifi: radio_test: single_domain fix sample build

the sample build started to fail after refactoring the original
peripheral/radio_test sample.

Use all source files from the parent sample as target sources.

Signed-off-by: Aleksandr Mirlenko <aleksandr.mirlenko@nordicsemi.no>

Author: Mirlenko

samples/wifi/radio_test/single_domain/CMakeLists.txt

@@ -18,11 +18,11 @@ endif()
 
 target_include_directories(app PRIVATE ${common_rt_dir}/inc)
 
+file(GLOB perip_rt_sources ${perip_rt_dir}/src/*.c)
+
 # NORDIC SDK APP START
 target_sources(app PRIVATE
-  ${perip_rt_dir}/src/main.c
-  ${perip_rt_dir}/src/radio_test.c
-  ${perip_rt_dir}/src/radio_cmd.c
+  ${perip_rt_sources}
   ${common_rt_dir}/src/nrf_wifi_radio_test_shell.c
 )