logging: Log Info messages unconditionally

Previously Info-level logging when a category was specified (via
LogPrintLevel) would only print the corresponding log message if
`-debug=category` were specified, while Info-level logging without a
category would always be printed. Make this more consistent by having
Info messages always be logged, whether they include a category or not.

Author: ajtowns

src/logging.cpp

@@ -126,9 +126,9 @@ bool BCLog::Logger::WillLogCategory(BCLog::LogFlags category) const
 
 bool BCLog::Logger::WillLogCategoryLevel(BCLog::LogFlags category, BCLog::Level level) const
 {
-    // Log messages at Warning and Error level unconditionally, so that
+    // Log messages at Info, Warning and Error level unconditionally, so that
     // important troubleshooting information doesn't get lost.
-    if (level >= BCLog::Level::Warning) return true;
+    if (level >= BCLog::Level::Info) return true;
 
     if (!WillLogCategory(category)) return false;