msvc-go-wine: don't hard-fail devcmd setup when ConnectionManagerExe is missing.

Not every MSVC/WinSDK download selection includes the Linux
ConnectionManagerExe component; a missing optional component shouldn't
abort the whole Developer Command Prompt setup.

diff --git a/Common7/Tools/vsdevcmd/ext/ConnectionManagerExe.bat b/Common7/Tools/vsdevcmd/ext/ConnectionManagerExe.bat
index 871b9af..f069a25 100644
--- a/Common7/Tools/vsdevcmd/ext/ConnectionManagerExe.bat
+++ b/Common7/Tools/vsdevcmd/ext/ConnectionManagerExe.bat
@@ -10,7 +10,7 @@ set "PATH=%PATH%;%VSINSTALLDIR%Common7\IDE\VC\Linux\bin\ConnectionManagerExe"
 goto :end
 
 :error_setting_path
-exit /B 1
+exit /B 0
 
 goto :end