[jay23606]

Bug

The Windows MSI installer creates a system PATH entry for cloudflared whose value ends with a period, for example C:\Program Files (x86)\cloudflared\.. The value comes from the CFDPATH variable in wix.json, which is set to [INSTALLDIR]..

A trailing dot is not a valid directory entry on Windows.

Change

• wix.json: change the CFDPATH value from [INSTALLDIR]. to [INSTALLDIR]. INSTALLDIR already ends with a backslash, so the entry is a clean directory path.
• cmd/cloudflared/wix_test.go: add TestWixPathEnvValueHasNoTrailingDot, which reads wix.json and asserts that the CFDPATH value is exactly [INSTALLDIR].

Testing

• After the fix, go test -count=1 -run TestWixPathEnvValueHasNoTrailingDot -v ./cmd/cloudflared passes.
• gofmt -l cmd/cloudflared/wix_test.go reports no files.

I did not build the MSI on this machine, so the installed PATH value has not been checked end to end.

Regression test: TestWixPathEnvValueHasNoTrailingDot in cmd/cloudflared/wix_test.go

Fixes #1049