refactor: make shared_qobject_ptr ctor explicit

This turns issues like creating two shared ptrs from a single raw ptr
from popping up at runtime, instead making them a compile error.

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/minecraft/auth/flows/Offline.cpp

@@ -6,12 +6,12 @@ OfflineRefresh::OfflineRefresh(
     AccountData *data,
     QObject *parent
 ) : AuthFlow(data, parent) {
-    m_steps.append(new OfflineStep(m_data));
+    m_steps.append(makeShared<OfflineStep>(m_data));
 }
 
 OfflineLogin::OfflineLogin(
     AccountData *data,
     QObject *parent
 ) : AuthFlow(data, parent) {
-    m_steps.append(new OfflineStep(m_data));
+    m_steps.append(makeShared<OfflineStep>(m_data));
 }