MIAMI — Miami-Dade Mayor Daniella Levine Cava said Friday she is “quarantining at home” after testing positive for COVID-19 — for the second time since the pandemic began. “This morning, I took a COVID-19 test as standard protocol after experiencing mild symptoms,” she said on Twitter. “Unfortunately, I tested positive. I ’m grateful that I’m fully vaccinated and boosted.” Loren Parra, Levine Cava’s communications director, said the mayor began feeling ill Thursday afternoon. Levine Cava did not wear a mask Thursday while speaking at an indoor symposium held by the Bilzin law firm, according t…