Catch C++ exceptions by const reference

Fixes #2277

application/pages/instance/ServersPage.cpp

@@ -109,7 +109,7 @@ static std::unique_ptr <nbt::tag_compound> parseServersDat(const QString& filena
 
 		return std::move(pair.second);
 	}
-	catch(...)
+	catch (...)
 	{
 		return nullptr;
 	}
@@ -125,7 +125,7 @@ static bool serializeServerDat(const QString& filename, nbt::tag_compound * leve
 		FS::write(filename, val);
 		return true;
 	}
-	catch(...)
+	catch (...)
 	{
 		return false;
 	}

application/pages/instance/VersionPage.cpp

@@ -200,7 +200,7 @@ bool VersionPage::reloadComponentList()
 		m_profile->reload(Net::Mode::Online);
 		return true;
 	}
-	catch (Exception &e)
+	catch (const Exception &e)
 	{
 		QMessageBox::critical(this, tr("Error"), e.cause());
 		return false;
@@ -269,7 +269,7 @@ void VersionPage::on_moveUpBtn_clicked()
 	{
 		m_profile->move(currentRow(), ComponentList::MoveUp);
 	}
-	catch (Exception &e)
+	catch (const Exception &e)
 	{
 		QMessageBox::critical(this, tr("Error"), e.cause());
 	}
@@ -282,7 +282,7 @@ void VersionPage::on_moveDownBtn_clicked()
 	{
 		m_profile->move(currentRow(), ComponentList::MoveDown);
 	}
-	catch (Exception &e)
+	catch (const Exception &e)
 	{
 		QMessageBox::critical(this, tr("Error"), e.cause());
 	}