explicitly check write status for dir

Signed-off-by: crueter <crueter@eden-emu.dev>

src/qt_common/qt_common.cpp

@@ -123,7 +123,7 @@ FirmwareInstallResult InstallFirmware(const QString& location,
 
     // Locate and erase the content of nand/system/Content/registered/*.nca, if any.
     auto sysnand_content_vdir = system->GetFileSystemController().GetSystemNANDContentDirectory();
-    if (!sysnand_content_vdir->CleanSubdirectoryRecursive("registered")) {
+    if (sysnand_content_vdir->IsWritable() && !sysnand_content_vdir->CleanSubdirectoryRecursive("registered")) {
         return FirmwareInstallResult::FailedDelete;
     }