Fix user created session saved on exit issue if multi-Inst is enabled

Ref: #12079 (comment)

PowerEditor/src/Notepad_plus.cpp

@@ -6654,7 +6654,7 @@ std::vector<generic_string> Notepad_plus::loadCommandlineParams(const TCHAR * co
 			const bool isSnapshotMode = false;
 			const bool shouldLoadFileBrowser = true;
 
-			if ((nppGUI._multiInstSetting == multiInstOnSession) || (nppGUI._multiInstSetting == multiInst))
+			if (nppGUI._multiInstSetting == multiInstOnSession)
 				nppParams.setLoadedSessionFilePath(fnss.getFileName(0));
 			loadSession(session2Load, isSnapshotMode, shouldLoadFileBrowser);
 		}