Take file start offset into account when determining failure

DCC resumes now complete properly
Fixes issue 3729

Change-Id: I6f682835f16b247302dca5f632c492ea4348f610
Reviewed-on: http://gerrit.dmdirc.com/842
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Gregory Holmes <greg@dmdirc.com>

src/com/dmdirc/addons/dcc/DCCTransferWindow.java

         ActionManager.processEvent(DCCActions.DCC_SEND_SOCKETCLOSED, null, this);
         if (!isWindowClosing()) {
             synchronized (this) {
-                if (transferCount == dcc.getFileSize()) {
+                if (transferCount == dcc.getFileSize() - dcc.getFileStart()) {
                     status.setText("Status: Transfer Compelete.");
 
                     if (showOpen && dcc.getType() == DCCTransfer.TransferType.RECEIVE) {