Closing a SSLSockets input or output stream does not close the socket (https://issuetracker.google.com/issues/37018094)

Summary:
When you close a SSLSockets input or output stream the socket does not get closed leading to may
sockets in the CLOSE_WAIT state. This will eventually deplete the available file descriptors

Test Plan:
Before appying this patch share a file from desktop to android
After the share is finished issue the command:

netstat -pW | grep kde

There should be a line showing that the socket used is in the state CLOSE_WAIT like below

tcp6  0 0 ::ffff:192.168.0.32:33604   ::ffff:192.168.0.2:1739  CLOSE_WAIT  6200/org.kde.kdeconnect_tp

Apply this patch and repeat the test. Now there should no longer be any sockets in the CLOSE_WAIT state

Reviewers: #kde_connect, nicolasfella

Reviewed By: #kde_connect, nicolasfella

Subscribers: nicolasfella, kdeconnect

Tags: #kde_connect

Differential Revision: https://phabricator.kde.org/D17320