Show Site Search reports in Scheduled email reports and Piwik Mobile

[tsteur]

A user reported the Site Search report is not available in the mobile app and I noticed the report is not included in API.getReportMetadata.

The reason for this is a check for the idSite parameter: https://github.com/piwik/piwik/blob/master/plugins/Actions/Actions.php#L503

This does not work:
http://demo.piwik.org/index.php?module=API&method=API.getReportMetadata&idSites=3&period=day&date=yesterday&format=JSON&token_auth=anonymous

This does work:
http://demo.piwik.org/index.php?module=API&method=API.getReportMetadata&idSites=3&period=day&date=yesterday&format=JSON&token_auth=anonymous&idSite=3

It should work without the idSite parameter as well.

[tsteur]

In 2da1fc7: fixes #4869 site search was not included in report metadata

[tsteur]

In f3a53e2: refs #4869 fix tests