[Qt] fix rpc console font size to flexible metrics

should fix #5897

Author: jonasschnelli

src/qt/rpcconsole.cpp

@@ -357,7 +357,6 @@ void RPCConsole::clear()
     ui->messagesWidget->document()->setDefaultStyleSheet(
                 "table { }"
                 "td.time { color: #808080; padding-top: 3px; } "
-                "td.message { font-family: monospace; font-size: 12px; } " // Todo: Remove fixed font-size
                 "td.cmd-request { color: #006060; } "
                 "td.cmd-error { color: red; } "
                 "b { color: #006060; } "