Fix #80312: change default engine from MyISAM to InnoDB

[marinesovitch]

change mysqli and pdo_mysql tests configuration to use by default
InnoDB instead of MyISAM

[marinesovitch]

I've checked logs under
https://dev.azure.com/phpazuredevops/eb1f6f74-bc61-47a6-a414-0e3ff41c9bb4/_build/results?buildId=12813
and from what I see, there has failed one test:
ext/sockets/tests/socket_getopt.phpt
in following line:
echo "interface 1:\n";
$r = socket_set_option($s, $level, IP_MULTICAST_IF, 1);

but I don't see how changes from my pull-request could affect it. Is there any chance that it has failed by accident due to other random reasons related to building host?

[nikic]

@marinesovitch Yeah, that's a spurious failure. I forgot to merge this PR after approving, which I've remedied now :)

[marinesovitch]

ufff thnx! that's good - my first PHP pull request successfully submitted && merged :-)