Fix bug where `PLE1307` was raised when formatting `%c` with characters #21151

Job	Run time
cargo clippy	2m 19s
benchmarks	9m 16s
cargo fuzz	5m 48s
cargo fmt	19s
cargo test (wasm)	1m 56s
cargo test (windows)	7m 59s
cargo test (linux)	3m 20s
cargo udeps	1m 44s
Determine changes	12s
pre-commit	51s
mkdocs	2m 14s
python package	1m 58s
test scripts	1m 10s
formatter instabilities and black similarity	0s
ecosystem	13m 1s
test ruff-lsp	24s
	52m 31s

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