Don't use pragma omp simd in Deposition

[AlexanderSinn]

It looks like for MacOS, the beam deposition was vectorized with OMP. If particles deposit in the same cell, this would lead to incorrect results. Usually the compiler is not able to vectorize these functions, and we don't notice this.

Additionally, I fixed two cases where bool values were implicitly converted. This did not seem to affect results.

• 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

[MaxThevenet]

Looks good, thanks!