chore(core): make vendor_unsafe.toif small

core/embed/vendorheader/T3T1/vendor_dev_DO_NOT_SIGN.json

@@ -1,5 +1,5 @@
 {
-    "header_len": 4608,
+    "header_len": 1024,
     "text": "DEV ONLY, DO NOT USE!",
     "hw_model": "T3T1",
     "expiry": 0,

core/embed/vendorheader/T3T1/vendor_dev_DO_NOT_SIGN.toif

@@ -0,0 +1 @@
+vendor_unsafe.toif

core/embed/vendorheader/T3T1/vendor_unsafe.json

@@ -1,9 +1,9 @@
 {
-    "header_len": 4608,
+    "header_len": 1024,
     "text": "UNSAFE, DO NOT USE!",
     "hw_model": "T3T1",
     "expiry": 0,
-    "version": [0, 1],
+    "version": [0, 0],
     "sig_m": 2,
     "trust": {
         "allow_run_with_secret": false,