refactor: remove redundant API call (#175)

Combines the two installation requests (org and user) into one because
`/org/{org}` can also be accessed at `/users/{org}`.

---------

Co-authored-by: Gregor Martynus <39992+gr2m@users.noreply.github.com>

tests/snapshots/index.js.md

@@ -114,6 +114,26 @@ Generated by [AVA](https://avajs.dev).
     ::save-state name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
     ::save-state name=expiresAt::2016-07-11T22:14:10Z`
 
+## main-token-get-owner-set-fail-response.test.js
+
+> stderr
+
+    ''
+
+> stdout
+
+    `repositories not set, creating token for all repositories for given owner "smockle"␊
+    Failed to create token for "smockle" (attempt 1): GitHub API not available␊
+    ::add-mask::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
+    ␊
+    ::set-output name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
+    ␊
+    ::set-output name=installation-id::123456␊
+    ␊
+    ::set-output name=app-slug::github-actions␊
+    ::save-state name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
+    ::save-state name=expiresAt::2016-07-11T22:14:10Z`
+
 ## main-token-get-owner-set-repo-fail-response.test.js
 
 > stderr
@@ -191,7 +211,7 @@ Generated by [AVA](https://avajs.dev).
     ::save-state name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
     ::save-state name=expiresAt::2016-07-11T22:14:10Z`
 
-## main-token-get-owner-set-to-org-repo-unset.test.js
+## main-token-get-owner-set-repo-unset.test.js
 
 > stderr
 
@@ -210,45 +230,6 @@ Generated by [AVA](https://avajs.dev).
     ::save-state name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
     ::save-state name=expiresAt::2016-07-11T22:14:10Z`
 
-## main-token-get-owner-set-to-user-fail-response.test.js
-
-> stderr
-
-    ''
-
-> stdout
-
-    `repositories not set, creating token for all repositories for given owner "smockle"␊
-    Failed to create token for "smockle" (attempt 1): GitHub API not available␊
-    ::add-mask::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
-    ␊
-    ::set-output name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
-    ␊
-    ::set-output name=installation-id::123456␊
-    ␊
-    ::set-output name=app-slug::github-actions␊
-    ::save-state name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
-    ::save-state name=expiresAt::2016-07-11T22:14:10Z`
-
-## main-token-get-owner-set-to-user-repo-unset.test.js
-
-> stderr
-
-    ''
-
-> stdout
-
-    `repositories not set, creating token for all repositories for given owner "smockle"␊
-    ::add-mask::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
-    ␊
-    ::set-output name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
-    ␊
-    ::set-output name=installation-id::123456␊
-    ␊
-    ::set-output name=app-slug::github-actions␊
-    ::save-state name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
-    ::save-state name=expiresAt::2016-07-11T22:14:10Z`
-
 ## main-token-get-owner-unset-repo-set.test.js
 
 > stderr