[lldb][NFC] Use UnixSignal::CreateForHost in Process

These do the same thing but we have a specific function for it.

lldb/source/Target/Process.cpp

@@ -402,8 +402,7 @@ ConstString &Process::GetStaticBroadcasterClass() {
 }
 
 Process::Process(lldb::TargetSP target_sp, ListenerSP listener_sp)
-    : Process(target_sp, listener_sp,
-              UnixSignals::Create(HostInfo::GetArchitecture())) {
+    : Process(target_sp, listener_sp, UnixSignals::CreateForHost()) {
   // This constructor just delegates to the full Process constructor,
   // defaulting to using the Host's UnixSignals.
 }