Revert unintended .gitmodules change

Signed-off-by: Ashnaa Seth <ashnaaseth2325@gmail.com>

Author: ashnaaseth2325-oss

.gitmodules

@@ -3,7 +3,7 @@
 	url = ../../The-OpenROAD-Project/yosys.git
 [submodule "tools/OpenROAD"]
 	path = tools/OpenROAD
-	url = https://github.com/The-OpenROAD-Project/OpenROAD.git
+	url = ../OpenROAD.git
 [submodule "tools/yosys-slang"]
 	path = tools/yosys-slang
 	url = https://github.com/povik/yosys-slang.git