Fix tiling without OMP

[AlexanderSinn]

When compiling with -DHiPACE_COMPUTE=NOACC, tiling was turned ON by default leading to incorrect results. This PR fixes tiling and changes the default to off for NOACC.

• [ ] Small enough (< few 100s of lines), otherwise it should probably be split into smaller PRs
• [ ] Tested (describe the tests in the PR description)
• [ ] Runs on GPU (basic: the code compiles and run well with the new module)
• [ ] Contains an automated test (checksum and/or comparison with theory)
• [ ] Documented: all elements (classes and their members, functions, namespaces, etc.) are documented
• [ ] Constified (All that can be const is const)
• [ ] Code is clean (no unwanted comments, )
• [ ] Style and code conventions are respected at the bottom of https://github.com/Hi-PACE/hipace
• [ ] Proper label and GitHub project, if applicable

[AlexanderSinn]

Good point. I enabled the use of tiling again for noacc. However, by default, tiling is off for noacc, as I observed it being slower in a quick test. Before this PR, tiling was broken with noacc and enabled by default.