Remove sprout as a valid address format; fix validation of Hush transparent addrs

src/settings.cpp

@@ -276,13 +276,11 @@ QString Settings::getZboardAddr() {
 }
 
 bool Settings::isValidAddress(QString addr) {
-    QRegExp zcexp("^z[a-z0-9]{94}$",  Qt::CaseInsensitive);
     QRegExp zsexp("^z[a-z0-9]{77}$",  Qt::CaseInsensitive);
     QRegExp ztsexp("^ztestsapling[a-z0-9]{76}", Qt::CaseInsensitive);
-    QRegExp texp("^t[a-z0-9]{34}$", Qt::CaseInsensitive);
+    QRegExp texp("^R[a-z0-9]{33}$", Qt::CaseInsensitive);
 
-    return  zcexp.exactMatch(addr)  || texp.exactMatch(addr) || 
-            ztsexp.exactMatch(addr) || zsexp.exactMatch(addr);
+    return  texp.exactMatch(addr) || ztsexp.exactMatch(addr) || zsexp.exactMatch(addr);
 }
 
 // Get a pretty string representation of this Payment URI