VS: Use absolute target-specific directory for `resources.pri`

The change in commit v3.7.0-rc1~219^2 (VS: Use target-specific directory
for `resources.pri`, 2016-08-25) incorrectly specifies a relative path
for the `ProjectPriFullPath` value.  Fix it to use an absolute path.

Issue: #16106
Status Job ID Name Coverage
  External
passed kwrobot-branch-check