search-engine-tracker: Fix system format that uses 'comma' instead of 'dot' as decimal separator

Cristiano Fraga G. Nunes requested to merge (removed):patch-2 into gnome-3-36

The search-engine-tracker builds a query string by using a float number "FILENAME_RANK". But, in systems that use 'comma' instead of 'dot' as decimal separator, this query string produces an error.

The solution was to change the FILENAME_RANK in the from float to integer to avoid using 'dot' or 'comma' separator in the query string.

Fixes: #1412 (closed)

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