web sql: Click on tables & sample queries works inconsistently

[smacker]

On tables it runs query but examples only changes input.

[carlosms]

For context: both of them worked similarly. Then in #209 we removed the autorun for the sample queries.

On one hand I agree with having consistency. On the other hand, the rationale from #209 does not apply to a DESCRIBE TABLE

Rationale: often you want to edit the query before running it or just to see the query for inspiration