loolwsd: Calc: core and client could be on 2 different tabs

The check for the current part was done before set view on core to the
one of the sender message

Change-Id: If4b9264c981ecc4e858d23366045e42be603c7c4

loolwsd/ChildSession.cpp

@@ -895,10 +895,10 @@ bool ChildSession::setClientPart(const char* /*buffer*/, int /*length*/, StringT
 
     auto lock(_loKitDocument->getLock());
 
+    _loKitDocument->setView(_viewId);
+
     if (part != _loKitDocument->getPart())
     {
-        _loKitDocument->setView(_viewId);
-
         _loKitDocument->setPart(part);
     }