Incorrect URL for obs4MIPs dataset quality flags

[tomvothecoder]

For obs4MIPs datasets that have the dataset quality flags set, clicking the hover link opens up a tab pointing to a non-existent URL. The <a> tag src needs to be updated to the latest URL.

Current incorrect URL: https://esgf-node.llnl.gov/projects/obs4mips/data-indicators
Correct URL: https://esgf-node.llnl.gov/projects/obs4mips/DatasetIndicators