fix(test/mqtt): Removes no-format from test_apps build

Allows warnings on mismatching format strings.

components/mqtt/test_apps/test_mqtt/main/CMakeLists.txt

@@ -6,4 +6,3 @@ endif()
 
 idf_component_register(SRCS "${srcs}"
                     PRIV_REQUIRES cmock test_utils mqtt nvs_flash app_update esp_eth esp_netif spi_flash common)
- target_compile_options(${COMPONENT_LIB} PRIVATE "-Wno-format")

components/mqtt/test_apps/test_mqtt5/main/CMakeLists.txt

@@ -2,4 +2,3 @@ set(srcs test_mqtt5_client_broker.c test_mqtt5.c)
 
 idf_component_register(SRCS "${srcs}"
                     PRIV_REQUIRES cmock test_utils mqtt nvs_flash app_update esp_eth esp_netif spi_flash common)
- target_compile_options(${COMPONENT_LIB} PRIVATE "-Wno-format")