app: Update app CMakeLists.txt template

The location of Mbed config cmake file `mbed_config.cmake` is moved from
root to build directory. App CMakeLists.txt template is updated to
reflect the same.

Author: urutva

src/mbed_tools/project/_internal/templates/CMakeLists.tmpl

@@ -4,7 +4,7 @@
 cmake_minimum_required(VERSION 3.19.0)
 
 set(MBED_PATH ${CMAKE_CURRENT_SOURCE_DIR}/mbed-os CACHE INTERNAL "")
-set(MBED_CONFIG_PATH ${CMAKE_CURRENT_SOURCE_DIR}/.mbedbuild CACHE INTERNAL "")
+set(MBED_CONFIG_PATH ${CMAKE_CURRENT_BINARY_DIR} CACHE INTERNAL "")
 set(APP_TARGET {{program_name}})
 
 include(${MBED_PATH}/tools/cmake/app.cmake)