[clang-format] Fix qualifier ordering for lines after PP directives (#160731)
Lines appearing after preprocessor conditional blocks (like `#endif`)
were not having their qualifiers reordered by `QualifierOrder`, while
lines inside the conditional blocks were processed correctly.
The issue was that tokens on lines following preprocessor directives
have `MustBreakBefore` = `true`. The qualifier alignment logic was
breaking immediately upon encountering any token with `MustBreakBefore`
= `true`, preventing analysis of the entire line.
The fix allows processing to continue when `MustBreakBefore` = `true` on
the first token of a line, since this is expected behavior (the token
legitimately starts a new line). Only tokens with `MustBreakBefore` =
`true` that appear mid-line will cause the analysis loop to break.
Fixes https://github.com/llvm/llvm-project/issues/160487.