Fix path replacement logic for test_package

The original Makefile used patsubst for string replacement, which
replaces only the first matching pattern. To prevent unintended
modifications to other test paths, replace 'strings.ReplaceAll' with
'strings.Replace'.

Bug: 399246722
Test: m dist platform_tests
Change-Id: I692c7400fbba914e7b0c4cfe81ae7dd0d07b803f