fix: remove "RT_MAX_LAYER" from config.json

It's already configured by tt-support-tool according to the current PDK. Removing it from the per-project config.json makes projects more portable between different tech nodes.

Author: urish

src/config.json

@@ -63,9 +63,8 @@
   "//": "Clock",
   "RUN_CTS": 1,
 
-  "//": "Don't use power rings or met5 layer",
+  "//": "Don't generate power rings",
   "FP_PDN_MULTILAYER": 0,
-  "RT_MAX_LAYER": "met4",
 
   "//": "MAGIC_DEF_LABELS may cause issues with LVS",
   "MAGIC_DEF_LABELS": 0,