Make msgwriter logs go to file only

This was the case for monero-wallet-cli already, but not for
monerod, which was making it pretty spammy as it was duplicating
intended output. Since my original intent was to ensure logs
included command output for debugging, this achieves both.

contrib/epee/include/misc_log_ex.h

@@ -60,6 +60,7 @@
 #define MCDEBUG(cat,x) CLOG(DEBUG,cat) << x
 #define MCTRACE(cat,x) CLOG(TRACE,cat) << x
 #define MCLOG(level,cat,x) ELPP_WRITE_LOG(el::base::Writer, level, el::base::DispatchAction::NormalLog, cat) << x
+#define MCLOG_FILE(level,cat,x) ELPP_WRITE_LOG(el::base::Writer, level, el::base::DispatchAction::FileOnlyLog, cat) << x
 
 #define MCLOG_COLOR(level,cat,color,x) MCLOG(level,cat,"\033[1;" color "m" << x << "\033[0m")
 #define MCLOG_RED(level,cat,x) MCLOG_COLOR(level,cat,"31",x)

src/common/scoped_message_writer.h

@@ -91,7 +91,7 @@ public:
     {
       m_flush = false;
 
-      MCLOG(m_log_level, "msgwriter", m_oss.str());
+      MCLOG_FILE(m_log_level, "msgwriter", m_oss.str());
 
       if (epee::console_color_default == m_color)
       {