[BUG] When calling init.sls via explicit init name, the name is treated as a directory name in context

[mlasevich]

Description

if "init" SLS is access using it's explicit name - i.e. path.to.init instead of path.to - the "init" part shows up as a directory component in various sls* context parmeters

Setup
Set up following file slspath/init.sls:

test:
  test.nop:
    - context:
        slspath: "{{ slspath }}"
        slsdotpath: "{{ slsdotpath }}"
        slscolonpath: "{{ slscolonpath }}"
        sls_path: "{{sls_path}}"

Steps to Reproduce the behavior

Run: salt-call state.show_sls slspath.init --output=yaml

Result:

# [INFO    ] Loading fresh modules for state activity
local:
  test:
    test:
    - context:
        slspath: slspath/init
        slsdotpath: slspath.init
        slscolonpath: slspath:init
        sls_path: slspath_init
    - nop
    - order: 10000
    __sls__: slspath.init
    __env__: base

As you see, "init" becomes a directory name, even though no such directory exists

Expected behavior

Expecting slspath to alway reflect actual path of the sls - i.e. in this case it should be slspath