It’s been eight months since actor Henry Goodman wqas fired after taking over Nathan Lane’s role in “The Producers.” “One minute, I was in the shower singing, thinking, `I just played to 60,000 people in a month, nobody’s asked for their money back, this thing is cooking. I knew I was different from Nathan, but I didn’t know difference was a sackable offense.” Now, after months of soul-searching, he’s back on Broadway in a big way…