Reset on a list type attribute with more than one value in the list is broken

[SimonaAlina]

ERROR: Traceback (most recent call last):
	File "/Users/simona/github/bazel-demos/lib2/BUILD", line 9, column 15, in <toplevel>
		opt_ts_project(
	File "/private/var/tmp/_bazel_simona/3099fbc7895a08f739515284f34cf219/external/with_cfg.bzl~0.2.1/with_cfg/private/wrapper.bzl", line 17, column 46, in lambda
		return lambda *, name, **kwargs: _wrapper(
	File "/private/var/tmp/_bazel_simona/3099fbc7895a08f739515284f34cf219/external/with_cfg.bzl~0.2.1/with_cfg/private/wrapper.bzl", line 129, column 48, in _wrapper
		processed_kwargs = _process_attrs_for_reset(
	File "/private/var/tmp/_bazel_simona/3099fbc7895a08f739515284f34cf219/external/with_cfg.bzl~0.2.1/with_cfg/private/wrapper.bzl", line 211, column 42, in _process_attrs_for_reset
		first_pass_attrs[attr] = map_attr(attr_func, attrs[attr])
	File "/private/var/tmp/_bazel_simona/3099fbc7895a08f739515284f34cf219/external/with_cfg.bzl~0.2.1/with_cfg/private/select.bzl", line 7, column 20, in map_attr
		return func(attribute)
	File "/private/var/tmp/_bazel_simona/3099fbc7895a08f739515284f34cf219/external/with_cfg.bzl~0.2.1/with_cfg/private/wrapper.bzl", line 204, column 50, in lambda
		attr_func = lambda dep: _replace_dep_attr(
	File "/private/var/tmp/_bazel_simona/3099fbc7895a08f739515284f34cf219/external/with_cfg.bzl~0.2.1/with_cfg/private/wrapper.bzl", line 226, column 32, in _replace_dep_attr
		_replace_single_dep(
	File "/private/var/tmp/_bazel_simona/3099fbc7895a08f739515284f34cf219/external/with_cfg.bzl~0.2.1/with_cfg/private/wrapper.bzl", line 276, column 21, in _replace_single_dep
		reset_target(
	File "/private/var/tmp/_bazel_simona/3099fbc7895a08f739515284f34cf219/external/with_cfg.bzl~0.2.1/with_cfg/private/wrapper.bzl", line 132, column 68, in lambda
		reset_target = lambda *, name, exports: transitioning_alias(
Error in opt_ts_project_reset: opt_ts_project_reset rule 'ts__deps_0' in package 'lib2' conflicts with existing opt_ts_project_reset rule, defined at /Users/simona/github/bazel-demos/lib2/BUILD:9:15
ERROR: Skipping '//lib2:ts': no such target '//lib2:ts': target 'ts' not declared in package 'lib2' defined by /Users/simona/github/bazel-demos/lib2/BUILD (Tip: use `query "//lib2:*"` to see all the targets in that package)
WARNING: Target pattern parsing failed.
ERROR: no such target '//lib2:ts': target 'ts' not declared in package 'lib2' defined by /Users/simona/github/bazel-demos/lib2/BUILD (Tip: use `query "//lib2:*"` to see all the targets in that package)

I want to use with_cfg with reset feature on ts_project target resetting deps attribute, but if the deps attribute contains more than one value I received the above error. This issue can be reproduced using this project: https://github.com/SimonaAlina/bazel-demos (more details in the readme file).

Thank you!

[fmeum]

Confirmed that this is fixed by #66.