cli-command: Fix wrong condition check of pa_module_loadHEADmaster

pa_module_load API's return value is integer which is
enum pa_error_code_t with minus such as -PA_ERR_IO
if the module loading is failed.
pa_cli_command_load gets a return value of pa_module_load
as pa_error_code_t which is wrong.
Minus integer value could not covert to enum which is defined
equal or larger than 0 so that pa_cli_command_load would
recognize the return value as larger than 0 if pa_module_load
return value (integer) is minus.

To fix this issue, I modified return value check logic
of pa_module_load API.
As same as pa_module_load's return type, integer would be used
to check if module load is failed in pa_cli_command_load
and the return value would be compared with minus.

Fixes: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/3801
Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/814>

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