detect correctly running instances under win with built version. fixes #3050

src/gajim.py

@@ -267,7 +267,7 @@ def pid_alive():
 					return b.contents.szExeFile
 				f = k.Process32Next(h, b)
 
-		if get_p(pid) == 'python.exe':
+		if get_p(pid) in ('python.exe', 'gajim.exe'):
 			return True
 		return False
 	try: