LibCore: Make ProxyData::port a u16

TCP ports are always u16 and this prevents invalid values from getting
into this field somehow.

Libraries/LibCore/Proxy.h

@@ -21,7 +21,7 @@ struct ProxyData {
     } type { Type::Direct };
 
     IPv4Address host_ipv4;
-    int port { 0 };
+    u16 port { 0 };
 
     bool operator==(ProxyData const& other) const = default;
 

Libraries/LibIPC/Decoder.cpp

@@ -178,7 +178,7 @@ ErrorOr<Core::ProxyData> decode(Decoder& decoder)
 {
     auto type = TRY(decoder.decode<Core::ProxyData::Type>());
     auto host_ipv4 = IPv4Address(TRY(decoder.decode<u32>()));
-    auto port = TRY(decoder.decode<int>());
+    auto port = TRY(decoder.decode<u16>());
 
     return Core::ProxyData { type, host_ipv4, port };
 }