Don't Append Framework to File if -f is Specified

[abbotware]

my output file name is being mangled when I specify -f (for framework)

in the below use case it is only running the one framework not multiple

dotnet test $Source --filter $TestFilter -f $Framework -c $Configuration /p:NetCoreSdk=$NetCoreSdk --logger:"trx;LogFileName=$TrxFile" --results-directory:$TestResultsPath /p:CoverletOutputFormat=cobertura /p:CoverletOutput=$TestResultsPath$CoverageDataFile /p:CollectCoverage=true /p:ExcludeByAttribute="Obsolete%2cGeneratedCodeAttribute%2cCompilerGeneratedAttribute" -nodeReuse:false

where $CoverageDataFile=project.Release.linux-x64.netcoreapp3.1.coverage.xml
and for some reason the output file is actually:
project.Release.linux-x64.netcoreapp3.1coverage.netcoreapp3.1.xml.cobertura.xml

i believe this is related to #636

[MarcoRossignoli]

Sorry I meant the coverage issue #649 (comment)

not the -f that isn't a bug, but a correct behaviour

[MarcoRossignoli]

The "append file type extension" was fixed in #668