Broken addresses on command line no longer trigger testnet.

When passing a bitcoin: URI on the command line, invalid addresses do not incorrectly send the
user to the test network.

src/base58.h

@@ -104,6 +104,7 @@ public:
     bool Set(const CScriptID &id);
     bool Set(const CTxDestination &dest);
     bool IsValid() const;
+    bool IsValid(const CChainParams &params) const;
 
     CBitcoinAddress() {}
     CBitcoinAddress(const CTxDestination &dest) { Set(dest); }