Fall back to base boot version if Astra thinks it's not installed

I accidentally gave Astra the FFXIV 1.0 installer, and thus it ended up
in an invalid state (of course, since there's no ARR boot components.)
Instead of saying "this game version isn't supported" we should just use
the fallback version to re-initialize your game.

launcher/src/profile.cpp

@@ -289,6 +289,9 @@ QString Profile::dalamudChannelName() const
 
 QString Profile::bootVersion() const
 {
+    if (m_bootVersion == nullptr || strlen(m_bootVersion) == 0) {
+        return QStringLiteral("2012.01.01.0000.0000");
+    }
     return QString::fromLatin1(m_bootVersion);
 }