Fix species page showing individuals vs observations

[mikkohei13]

Repro:

• Go to https://laji.fi/observation/statistics?target=MX.229131
• Select Valitse tilastotyyppi -> yksilömäärä
• Go to https://laji.fi/taxon/MX.229131/occurrence
• See charts Havainnot kuukausittain Suomessa & Havainnot vuosittain Suomessa

Expected:

• Both shows observation count, as the selection on step 2 should affect only observation search

Actual:

• First chart shows observation count (which is correct)
• Second chart shows individual count (which should be fixed)