Fix setting custom image attributes.

The variable name was not equal to the one used in the admin form so the value
put by the user was never saved in the database.

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>

Index: addtoany/addtoany.module
===================================================================
--- addtoany.orig/addtoany.module
+++ addtoany/addtoany.module
@@ -197,7 +197,7 @@
       $button_image,
       $button_width,
       $button_height,
-      variable_get('addtoany_image_attributes', 'alt="Share/Save"')
+      variable_get('addtoany_custom_image_attributes', 'alt="Share/Save"')
   ));
 
 }
Index: addtoany/addtoany.admin.inc
===================================================================
--- addtoany.orig/addtoany.admin.inc
+++ addtoany/addtoany.admin.inc
@@ -83,7 +83,7 @@
   $form['addtoany_button_settings']['addtoany_custom_image_attributes'] = array(
     '#type'          => 'textfield',
     '#title'         => t('Button image HTML attributes'),
-    '#default_value' => variable_get('addtoany_image_attributes', 'alt="Share/Save"'),
+    '#default_value' => variable_get('addtoany_custom_image_attributes', 'alt="Share/Save"'),
     '#description'   => t('Extra HTML attributes for img tag. Example: alt=""'),
   );
   
@@ -114,4 +114,4 @@
   );
   
   return system_settings_form($form);
-}
\ No newline at end of file
+}