Don't expand ~ in ISpoofFile

This way, we can write the original value back to the config. Also, this "fixes"
a bug because webadmin didn't do this step.

Signed-off-by: Uli Schlachter <psychon@znc.in>

znc.cpp

@@ -1650,10 +1650,6 @@ bool CZNC::DoRehash(CString& sError)
 					m_sISpoofFormat = sValue;
 					continue;
 				} else if (sName.Equals("ISpoofFile")) {
-					if (sValue.Left(2) == "~/") {
-						sValue.LeftChomp(2);
-						sValue = GetHomePath() + "/" + sValue;
-					}
 					m_sISpoofFile = sValue;
 					continue;
 				} else if (sName.Equals("MOTD")) {