app-accessibility/whisper-cpp: remove non-POSIX features

Closes: https://bugs.gentoo.org/974649
Signed-off-by: Kevin Martin <kevinmbecause@gmail.com>

app-accessibility/whisper-cpp/files/whisper-cpp.init

@@ -5,10 +5,10 @@
 supervisor=supervise-daemon
 description="Whisper-CPP Service"
 command="/usr/bin/whisper-server"
-command_args+=" -m ${whisper_model}"
+command_args="${command_args} -m ${whisper_model}"
 required_files="${whisper_model}"
 
 start_pre() {
         checkpath --directory --owner $command_user --mode 0775 \
                 /var/log/$RC_SVCNAME
-}
+}