fix log level for ofFBO allocation message

issues log message at log level OF_LOG_VERBOSE instead of OF_LOG_NOTICE in an effort to de-clutter log output.

Signed-off-by: tgfrerer <tim@poniesandlight.co.uk>
Merge pull request #2584 from tgfrerer/fix-ofFbo-allocation-log-message-loglevel

fix log level for ofFBO allocation message