Prevent allocations caused by Logger::log_trace

C++ would always construct an `std::string` from the string constant
every iteration. Since this also happened when `YABRIDGE_DEBUG_LEVEL` is
not set to 2, this ended up causing unnecessary allocations.

src/common/logging/common.cpp

@@ -125,9 +125,3 @@ void Logger::log(const std::string& message) {
 
     *stream << formatted_message.str() << std::flush;
 }
-
-void Logger::log_trace(const std::string& message) {
-    if (verbosity >= Verbosity::all_events) {
-        log(message);
-    }
-}