[nrf fromlist] shell: Increase maximum argc count

Increase the shell's maximum argc count to handle both
mandatory and optional arguments in the Wi-Fi commands.

Upstream PR #: 86974

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

Author: D-Triveni

subsys/shell/Kconfig

@@ -108,7 +108,7 @@ config SHELL_DEFAULT_TERMINAL_HEIGHT
 config SHELL_ARGC_MAX
 	int "Maximum arguments in shell command"
 	range 3 $(UINT8_MAX)
-	default 20
+	default 30
 	help
 	  Maximum number of arguments that can build a command.