pdfconverter: Strip trailing slash (/) in folder path

[manoedinata]

Leaving trailing slashes in the target folder path can lead to unexpected result location.

For example, given folderName input as hvlda-gmxe/ (note the trailing slash), instead of

   hvlda-gmxe.pdf

, the PDF result will be located in

   hvlda-gmxe/.pdf

Strip the trailing slash from the given folder name input.

Reference: https://stackoverflow.com/a/10408845

[marcorentap]

this is great, thanks!