Add fw dumping

- also fatfs is stupid
- also close files properly on a failed copy
- also check for errors during folder readouts
- also make sure holding vol- doesn't dump the keys anyway

source/storage/gptmenu.c

@@ -82,6 +82,7 @@ void GptMenu(u8 MMCType){
             else {
                 if (TConf.curExplorerLoc > LOC_SD)
                     ResetCopyParams();
+                    
                 TConf.curExplorerLoc = LOC_EMMC;
                 FileExplorer("bis:/");
             }

source/storage/mountmanager.c

@@ -18,6 +18,10 @@ void SetKeySlots(){
         se_aes_key_set(3, dumpedKeys.bis_key[1] + AES_128_KEY_SIZE, AES_128_KEY_SIZE);
         se_aes_key_set(4, dumpedKeys.bis_key[2], AES_128_KEY_SIZE);
         se_aes_key_set(5, dumpedKeys.bis_key[2] + AES_128_KEY_SIZE, AES_128_KEY_SIZE);
+
+        // Not for bis but whatever
+        se_aes_key_set(6, dumpedKeys.header_key + 0x00, 0x10);
+        se_aes_key_set(7, dumpedKeys.header_key + 0x10, 0x10);
     }
 }