snippets: nrf70-wifi: Remove heap size override

Remove the heap size override as it is no longer
needed due to sufficient RAM availability.

Signed-off-by: Triveni Danda <[email protected]>

Author: D-Triveni

snippets/nrf70-wifi/nrf54h20_cpuapp.conf

@@ -3,5 +3,3 @@
 
 CONFIG_TEST_RANDOM_GENERATOR=y
 CONFIG_NET_SOCKETPAIR_HEAP=y
-CONFIG_HEAP_MEM_POOL_SIZE=139000
-CONFIG_HEAP_MEM_POOL_IGNORE_MIN=y