e8a17df test: add +x to assert.sh

Authored and Committed by bluca a year ago
    test: add +x to assert.sh
    
    The script has a shebang and .sh extension, so make it executable
    
    W: systemd-tests: script-not-executable [usr/lib/systemd/tests/testdata/units/assert.sh]
    (cherry picked from commit fb4f7271d9f75a44756b110706cdb53b82f407ce)
    
        
file modified
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