Restore the pre-#4606 license expectation for should_detect_something_5.pdf

The extra proprietary-license and cpal-1.0 expectations were added in
#4606, the same commit that stopped PDF text extraction after the first
page. They are artifacts of the truncated single-page text rather than
licenses present in the document.

With full extraction restored, the file matches sun-sissl-1.1 alone as a
single match over lines 1-315 at 89.08% coverage, which is exactly the
expectation this file had before #4606.

Signed-off-by: Ali Zulfiqar <codewithfourtix@gmail.com>

Author: codewithfourtix

tests/licensedcode/data/datadriven/lic4/should_detect_something_5.pdf.yml

@@ -1,4 +1,2 @@
 license_expressions:
   - sun-sissl-1.1
-  - proprietary-license
-  - cpal-1.0