Can't tell if that is a stamped or forged steel dropout, If it is stamped plate steel, you can mos likely do the fix yourself. Steel plate is very forgiving. You can hammer it back to shape but do it gradually so the steel's malleable properties will work with you and you can avoid causing cracks. Once you have it back straight, check really close for any cracking. Best to take off all the paint at the affected area to do so.
If it is a forged dropout, it will be harder to fix as it will be thicker/stiffer and heat will most likely be required to avoid cracking it. Applying heat to such critical parts of the bike which can have its brazing adversely affected, should really be left to a frame builder/specialist..... then you have to ask yourself how valuable is the frame and is it worth having to spend such money to fix it.