bazel: revert install_for_bazel drive-by changes

bazel/BUILD only existed to export the bazel-orfs patches I had
introduced.  Since those patches landed upstream (bazel-orfs PR The-OpenROAD-Project#720)
and were removed in the previous commit, the package is no longer
needed.  Dropping it lets //:install_for_bazel reference
bazel/install.sh as a same-package file again, the way it has been
on master since PR The-OpenROAD-Project#4003 — so this PR no longer touches that rule.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

Author: oharboe

BUILD.bazel

@@ -2,5 +2,5 @@ load("@rules_shell//shell:sh_binary.bzl", "sh_binary")
 
 sh_binary(
     name = "install_for_bazel",
-    srcs = ["//bazel:install.sh"],
+    srcs = ["bazel/install.sh"],
 )