Core/Log: Fix newlines when using dynamic log names

* thanks @Aokromes for reporting
* also removes an unnecessary std::move

src/server/shared/Logging/Appender.cpp

@@ -88,7 +88,7 @@ void Appender::write(LogMessage* message)
     if (flags & APPENDER_FLAGS_PREFIX_LOGFILTERTYPE)
         ss << '[' << message->type << "] ";
 
-    message->prefix = std::move(ss.str());
+    message->prefix = ss.str();
     _write(message);
 }
 

src/server/shared/Logging/AppenderFile.cpp

@@ -55,7 +55,7 @@ void AppenderFile::_write(LogMessage const* message)
         FILE* file = OpenFile(namebuf, "a", backup || exceedMaxSize);
         if (!file)
             return;
-        fprintf(file, "%s%s", message->prefix.c_str(), message->text.c_str());
+        fprintf(file, "%s%s\n", message->prefix.c_str(), message->text.c_str());
         fflush(file);
         fileSize += uint64(message->Size());
         fclose(file);