Tools/fsi.bat: rather only echo if error

Otherwise we might get unwanted output for certain consumers
of this (e.g. find.fsx, which can act kinda like a
crossplatform F#-based grep/find).

Tools/fsi.bat

@@ -3,15 +3,13 @@
 SET "VSWHERE=%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe"
 SET "INSTALL_MSG=Please install .NET v6, or higher; or Visual Studio."
 
-ECHO checking for '%VSWHERE%'...
 IF NOT EXIST "%VSWHERE%" (
     echo:
     echo Tool vswhere.exe not found.
     echo %INSTALL_MSG%
     exit /b 1
 )
 
-ECHO checking for fsi.exe...
 FOR /f "tokens=* delims=" %%A in ('"%VSWHERE%" -latest -requires Microsoft.VisualStudio.Component.FSharp -find **\fsi.exe') do set RUNNER=%%A
 
 IF "%RUNNER%"=="" (