Don't disable phpdbg on macos

I'm not sure what the original issue here was, but it seems to
be working fine now, so let's make sure it stays that way...

Author: nikic

azure/macos/job.yml

@@ -21,7 +21,6 @@ jobs:
         ./configure ${{ parameters.configurationParameters }} \
             --enable-option-checking=fatal \
             --prefix=/usr/local \
-            --disable-phpdbg \
             --enable-fpm \
             --with-pdo-mysql=mysqlnd \
             --with-mysqli=mysqlnd \