sysemu: Let VMChangeStateHandler take boolean 'running' argument

The 'running' argument from VMChangeStateHandler does not require
other value than 0 / 1. Make it a plain boolean.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
104 jobs for runstate_bool in 76 minutes and 25 seconds (queued for 2 seconds)
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