[QPG] Remove overrules for OpenThread buffer amount.

Will use the default 44 from OpenThread the stack

Author: tima-q

examples/platform/qpg/project_include/OpenThreadConfig.h

@@ -48,12 +48,6 @@
 // Enable use of external heap allocator (calloc/free) for OpenThread.
 #define OPENTHREAD_CONFIG_HEAP_EXTERNAL_ENABLE 1
 
-#if CHIP_DEVICE_CONFIG_THREAD_FTD
-#define OPENTHREAD_CONFIG_NUM_MESSAGE_BUFFERS 44
-#else
-#define OPENTHREAD_CONFIG_NUM_MESSAGE_BUFFERS 22
-#endif
-
 // Limit CLI buffers
 #define OPENTHREAD_CONFIG_CLI_UART_RX_BUFFER_SIZE 384
 #define OPENTHREAD_CONFIG_CLI_UART_TX_BUFFER_SIZE 512