fixing another merge issue

Signed-off-by: Jeff Ng <[email protected]>

Author: jeffng-or

flow/platforms/nangate45/config.mk

@@ -57,6 +57,7 @@ export IO_PLACER_V = metal6
 export PDN_TCL ?= $(PLATFORM_DIR)/grid_strategy-M1-M4-M7.tcl
 
 # Endcap and Welltie cells
+export TAPCELL_TCL ?= $(PLATFORM_DIR)/tapcell.tcl
 export TAP_CELL_NAME = TAPCELL_X1
 
 export MACRO_PLACE_HALO ?= 22.4 15.12