Raise the 90-character limit on Bech32 encodings

Regtest addresses are 91 characters, and ZIP 32's Bech32 encoding will
be significantly longer.

src/bech32.cpp

@@ -169,7 +169,7 @@ std::pair<std::string, data> Decode(const std::string& str) {
     }
     if (lower && upper) return {};
     size_t pos = str.rfind('1');
-    if (str.size() > 90 || pos == str.npos || pos == 0 || pos + 7 > str.size()) {
+    if (str.size() > 1023 || pos == str.npos || pos == 0 || pos + 7 > str.size()) {
         return {};
     }
     data values(str.size() - 1 - pos);