[ShipsLogControl] Log might not update if first entry text is the same as the latest

[oznogon]

Steps to reproduce:

1. Send a log-filling set of addToShipLog calls to a PlayerSpaceship during a scenario via the exec.lua HTTP API endpoint:

for i=1,100,1
do
player:addToShipLog("ack", "yellow")
end

1. Send the exact same set again a few seconds later, after no other log activity on the player ship.

Expected behavior:

The newest entries in the log have the newer timestamp.

Observed behavior:

The log doesn't appear to update.

This appears to be due to checks like these in ShipsLogControl:

EmptyEpsilon/src/screenComponents/shipsLogControl.cpp

Lines 42 to 47 in b3b6e91

	if (log_text->getEntryCount() > 0 && logs.size() > 0 && log_text->getEntryText(0) != logs[0].text)
	{
	bool updated = false;
	for(unsigned int n=1; n<log_text->getEntryCount(); n++)
	{
	if (log_text->getEntryText(n) == logs[0].text)

Specifically:

log_text->getEntryText(0) != logs[0].text

which returns true if two separate log entries from different times have identical text.