Remove WIRE_RC_LAYER

DATA_WIRE_RC_LAYER and CLOCK_WIRE_RC_LAYER should have been used instead

gf180mcu/openlane/config.tcl

diff --git a/gf180mcu/openlane/config.tcl b/gf180mcu/openlane/config.tcl
index 03f24e2..0f052b9 100644
--- a/gf180mcu/openlane/config.tcl
+++ b/gf180mcu/openlane/config.tcl
@@ -74,7 +74,6 @@
 set ::env(FP_PDN_VERTICAL_LAYER) "Metal4"
 set ::env(FP_PDN_HORIZONTAL_LAYER) "Metal5"
 set ::env(MACRO_BLOCKAGES_LAYER) "Metal1 Metal2 Metal3 Metal4 Metal5"
-set ::env(WIRE_RC_LAYER) "Metal2"
 set ::env(DATA_WIRE_RC_LAYER) "Metal2"
 set ::env(CLOCK_WIRE_RC_LAYER) "Metal4"
 

sky130/openlane/config.tcl

diff --git a/sky130/openlane/config.tcl b/sky130/openlane/config.tcl
index 0873fe1..f74d77b 100755
--- a/sky130/openlane/config.tcl
+++ b/sky130/openlane/config.tcl
@@ -167,7 +167,6 @@
 set ::env(MACRO_BLOCKAGES_LAYER) "li1 met1 met2 met3 met4"
 
 # Used for parasitics estimation, IR drop analysis, etc
-set ::env(WIRE_RC_LAYER) "met1"
 set ::env(DATA_WIRE_RC_LAYER) "met2"
 set ::env(CLOCK_WIRE_RC_LAYER) "met5"