[libc] Fix non-templated uses of `printf_core::Writer` (#131149) Commit 598e882ee88a1e3 turned `Writer` into a template, and updated most of the call sites that use it. But not all. The alternative FP printf system in `float_dec_converter_limited.h` wasn't updated, and neither was `baremetal/printf.cpp` or `baremetal/vprintf.cpp`. This patch updates `float_dec_converter_limited.h` in the same way that the previous commit updated `float_dec_converter.h`: propagate the templatedness through everything in the header, so that anything using a `Writer` at all has a `write_mode` template parameter to pass on to it. `printf.cpp` and `vprintf.cpp` are updated in the same way that the previous commit updated `printf_core/vfprintf_internal.h`: the `WriteBuffer` has parameter `WriteMode::FLUSH_TO_STREAM`, and `Writer` picks it up implicitly from that.
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