Hell in a Handbag's Midler revue is middling. Iconic singer Bette Midler cut her teeth at New York City's Continental Baths, earning the nickname "Bathhouse Betty" and an adoring legion of LGBTQ fans. In an impersonation honed over the last five years, performer Caitlin Jackson expertly captures the exuberance, confidence, and devil-may-care sex appeal of the Divine Miss M in her formativ…