distro_like: refactor distro -> distro_mod

This matches apkg convention that distro variable always refers to
--distro, not the distro module.

apkg/templatevars/distro_like.py

@@ -26,19 +26,19 @@ Example usage in rpm spec:
 {% endif %}
 """  # noqa
 
-import distro
+import distro as distro_mod
 
 from apkg import adistro
 
 
 # called by apkg to get custom variables
 def get_variables(env):
-    distro_var = env['distro']
+    distro = env['distro']
     # poor man's .copy()
-    distro_like = adistro.Distro(distro_var.orig, distro_var.aliases)
+    distro_like = adistro.Distro(distro.orig, distro.aliases)
 
-    if distro.id().lower() == distro_var.id.lower():
-        like = set(distro_var.names + distro.like().split())
+    if distro_mod.id().lower() == distro.id.lower():
+        like = set(distro.names + distro_mod.like().split())
         distro_like.names = list(like)
         return {'distro_like': distro_like}