C++ Output Window logger switched to ENABLEMPLOGGING and regressed formatting

Repro:
1. Create a new C++ Win32 app with ATL
2. Build

Results in VS 2015 Output Window (note two spaces in front of file names in the log):

```
1>------ Rebuild All started: Project: CPPWin32ConsoleApp, Configuration: Debug Win32 ------
1> stdafx.cpp
1> CPPWin32ConsoleApp.cpp
1> CPPWin32ConsoleApp.vcxproj -> C:\Users\kirillo\Documents\Visual Studio 2015\Projects\CPPWin32ConsoleApp\Debug\CPPWin32ConsoleApp.exe
1> CPPWin32ConsoleApp.vcxproj -> C:\Users\kirillo\Documents\Visual Studio 2015\Projects\CPPWin32ConsoleApp\Debug\CPPWin32ConsoleApp.pdb (Full PDB)
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========
```

Results in VS 2017 output window (note no spaces in front of file names):

```
1>------ Build started: Project: CppWin32Project1, Configuration: Debug Win32 ------
1>stdafx.cpp
1>CppWin32Project1.cpp
1>CppWin32Project1.vcxproj -> c:\users\kirillo\documents\visual studio 2017\Projects\CppWin32Project1\Debug\CppWin32Project1.exe
1>CppWin32Project1.vcxproj -> c:\users\kirillo\documents\visual studio 2017\Projects\CppWin32Project1\Debug\CppWin32Project1.pdb (Partial PDB)
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
```

Before:

After:

The issue seems to appear on Minimal and lower, and only to the output window.