Rename "FilesSharingAppContext" to "PublicShareContext"

Having both "FilesAppSharingContext" and "FilesSharingAppContext" was
confusing, so "FilesSharingAppContext" was renamed to a more descriptive
name.

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

tests/acceptance/config/behat.yml

@@ -17,9 +17,9 @@ default:
         - FileListContext
         - FilesAppContext
         - FilesAppSharingContext
-        - FilesSharingAppContext
         - LoginPageContext
         - NotificationContext
+        - PublicShareContext
         - SettingsContext
         - SettingsMenuContext
         - ThemingAppContext
@@ -44,9 +44,9 @@ default:
         - FileListContext
         - FilesAppContext
         - FilesAppSharingContext
-        - FilesSharingAppContext
         - LoginPageContext
         - NotificationContext
+        - PublicShareContext
         - SettingsContext
         - SettingsMenuContext
         - ThemingAppContext

tests/acceptance/features/bootstrap/FilesSharingAppContext.php → tests/acceptance/features/bootstrap/PublicShareContext.php

@@ -23,7 +23,7 @@
 
 use Behat\Behat\Context\Context;
 
-class FilesSharingAppContext implements Context, ActorAwareInterface {
+class PublicShareContext implements Context, ActorAwareInterface {
 
 	use ActorAware;
 	use FileListAncestorSetter;