Fix install-helper.pri
Fix install-helper.pri

Any path name with spaces must be enclosed in quotation marks.

Change-Id: I5100c83d7fd96ddf91313395e97be0e530465771
Reviewed-by: Sergey Belyashov <8871b4c2d635fca691211507eadbac3d0bc2695a@gmail.com>
Reviewed-by: Denis Shienkov <6a9c747bd2ba446682324cf340d3b86f30cf4d55@gmail.com>

RoadWorksSoftware/QtSerialPort-OS2,RoadWorksSoftware/QtSerialPort-OS2,kobolabs/qtserialport,kobolabs/qtserialport