FIX: remove third-party filament warning on N6 send-to-print dialog

Drop the warning rule targeting N6 + vendor=third party in
filaments_blacklist.json. The prompt wrongly interrupts the normal
send-to-print flow for non-Bambu filaments in the Send-to-Print dialog.

jira: STUDIO-17914
自测结果: pass (JSON syntax validated, rule removed; runtime retest on N6
send-to-print flow pending)

Made-with: Cursor
Change-Id: Ia2c99ebff5b165fa968c56ec6c5164819656bc33
Made-with: Cursor

Author: XinZhangBambu

resources/printers/filaments_blacklist.json

@@ -125,13 +125,6 @@
       "description": "How to feed TPU filament on X2D.",
       "wiki": "https://e.bambulab.com/t?c=PAxXqQu2zBgvN3ea"
     },
-    {
-      "white_names": ["support for PLA", "support for ABS", "support for PETG", "PVA", "ASA", "ABS", "PETG HF", "PETG Basic"],
-      "action": "warning",
-      "model_id":["N6"],
-      "vendor": "third party",
-      "description": "Using non-bambu filament may have printing quality issues."
-    },
     {
       "type": "TPU",
       "action": "warning",