Fix phpdbg local console mode when using libedit/readline #13199
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When using libedit/readline integration in phpdbg, EOF makes editline write prompt again in local console mode. For example, this can be noticed when reading phpt test files from STDIN and running phpdbg.
How to reproduce the issue:
./configure --with-readline --enable-phpdbg-readline make ./sapi/cli/php run-tests.php sapi/phpdbg # here tests fail with prompt being repeated in the output
After this patch, phpdbg tests pass.