rz-test: Assume `-C .` if `db/` dir not found #19562

Job	Run time
Build on old Debian ${{ matrix.container }}	0s
Build on CentOS 7	0s
Build on gcc 11 ASAN	0s
Build static	0s
changes	5s
Create source tarball	0s
Run debug tests on Ubuntu 20.04	0s
Test source tarball	0s
Build rizin rzpipe	0s
Build rz-bindgen	0s
linux-meson-clang-tests	1s
linux-meson-gcc-tests	21m 41s
macos-meson-clang-tests	15m 46s
linux-gcc-tests-asan	1h 3m 13s
linux-clang-tests-asan	51m 4s
linux-gcc-tests-codecov	2s
capstone-v4	1s
capstone-v5	1s
capstone-sys	2s
no-gpl-code	2s
Build Android ${{ matrix.name }} package	0s
Build Windows zip/installer ${{ matrix.name }}	0s
Build OSX package	0s
Test use as meson subproject	2m 21s
Include Rizin headers from C++ program (Linux)	0s
Publish Docker image on Docker Hub	0s
Test EXTRA_PREFIX works well	0s
Test Windows installer built with ${{ matrix.name }}	0s
Test OSX pkg	0s
Create draft release and upload artifacts	0s
	2h 34m 19s

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