qt/main: Unindent code in OnMenuInstallToNAND()

We can change this into an early-return if the filename is empty.
There's no need to include all of the code within the if statement.

src/yuzu/main.cpp

@@ -628,6 +628,10 @@ void GMainWindow::OnMenuInstallToNAND() {
     QString filename = QFileDialog::getOpenFileName(this, tr("Install File"),
                                                     UISettings::values.roms_path, file_filter);
 
+    if (filename.isEmpty()) {
+        return;
+    }
+
     const auto qt_raw_copy = [this](FileSys::VirtualFile src, FileSys::VirtualFile dest) {
         if (src == nullptr || dest == nullptr)
             return false;
@@ -679,7 +683,6 @@ void GMainWindow::OnMenuInstallToNAND() {
                QMessageBox::Yes;
     };
 
-    if (!filename.isEmpty()) {
     if (filename.endsWith("xci", Qt::CaseInsensitive)) {
         const auto xci = std::make_shared<FileSys::XCI>(
             vfs->OpenFile(filename.toStdString(), FileSys::Mode::Read));
@@ -744,8 +747,7 @@ void GMainWindow::OnMenuInstallToNAND() {
             nca, static_cast<FileSys::TitleType>(index), false, qt_raw_copy);
         if (res == FileSys::InstallResult::Success) {
             success();
-            } else {
-                if (res == FileSys::InstallResult::ErrorAlreadyExists) {
+        } else if (res == FileSys::InstallResult::ErrorAlreadyExists) {
             if (overwrite()) {
                 const auto res2 = Service::FileSystem::GetUserNANDContents()->InstallEntry(
                     nca, static_cast<FileSys::TitleType>(index), true, qt_raw_copy);
@@ -759,8 +761,6 @@ void GMainWindow::OnMenuInstallToNAND() {
             failed();
         }
     }
-        }
-    }
 }
 
 void GMainWindow::OnMenuSelectGameListRoot() {