Wells Fargo & Co.'s second-quarter earnings suffered under the ongoing effects of the Covid-19 pandemic. The bank reported a net loss of $2.38 billion, or 66 cents per diluted share, for the second quarter of 2020. That loss was largely due to a $8.4 billion addition to its loan-loss reserves. There was $1.2 billion in operating losses, including $765 million in accruals for customer remediation. Revenue for the quarter came to $17.8 billion, a roughly 18% drop from the $21.6 billion reported…