[mode] Mode format returns mode count, not the actual mode

It seems that the mode format returns how many times the mode appears, not the actual mode itself https://github.com/SemanticMediaWiki/SemanticResultFormats/blob/42c26905f5d9f25a321a0c3b286d5b0d239a8083/formats/math/SRF_Math.php#L187 https://github.com/SemanticMediaWiki/SemanticResultFormats/blob/42c26905f5d9f25a321a0c3b286d5b0d239a8083/formats/math/SRF_Math.php#L189 https://github.com/SemanticMediaWiki/SemanticResultFormats/blob/42c26905f5d9f25a321a0c3b286d5b0d239a8083/formats/math/SRF_Math.php#L201 array_count_values gives counts as values, and max gets the max value, meaning $max is a count, not the most common property value

It seems the unit test even expects the count instead of the actual mode

https://github.com/SemanticMediaWiki/SemanticResultFormats/blob/42c26905f5d9f25a321a0c3b286d5b0d239a8083/tests/phpunit/Integration/JSONScript/TestCases/math-01.json#L309-L313

https://github.com/SemanticMediaWiki/SemanticResultFormats/blob/42c26905f5d9f25a321a0c3b286d5b0d239a8083/tests/phpunit/Integration/JSONScript/TestCases/math-01.json#L94-L95

https://github.com/SemanticMediaWiki/SemanticResultFormats/blob/42c26905f5d9f25a321a0c3b286d5b0d239a8083/tests/phpunit/Integration/JSONScript/TestCases/math-01.json#L14-L15

The mode should be 333, the only number, but instead it expects and gets how many times 333 occurs