Use passive mode when downloading. (Checking in for Jeffrey Baker.)

[nsbeta2+ b = 40655; r=sgehani,dbragg]

xpinstall/wizard/unix/src2/nsXIEngine.cpp

@@ -297,6 +297,7 @@ nsXIEngine::FTPAnonGet(char *aHost, char *aDir, char *aArchive)
 ftp -n %s <<EndFTP\n\
 user anonymous dev@null.edu\n\
 binary\n\
+passive\n\
 get %s %s\n\
 EndFTP\n\
 \