Fixed typo.

app/models/observer/ticket/escalation_calculation.rb

@@ -7,7 +7,7 @@ class Observer::Ticket::EscalationCalculation < ActiveRecord::Observer
   def after_update(record)
 
     # return if we run import mode
-    return if Setting.get('import_mode') && !Setting.get('import_igonre_sla')
+    return if Setting.get('import_mode') && !Setting.get('import_ignore_sla')
 
     # prevent loops
     return if record[:escalation_calc]

db/seeds.rb

@@ -1029,7 +1029,7 @@ Setting.create_if_not_exists(
 )
 Setting.create_if_not_exists(
   :title       => 'Ignore Escalation/SLA Information',
-  :name        => 'import_igonre_sla',
+  :name        => 'import_ignore_sla',
   :area        => 'Import::Base',
   :description => 'Ignore Escalation/SLA Information form import system.',
   :options     => {
@@ -1037,7 +1037,7 @@ Setting.create_if_not_exists(
       {
         :display  => '',
         :null     => true,
-        :name     => 'import_igonre_sla', 
+        :name     => 'import_ignore_sla', 
         :tag      => 'boolean',
         :options  => {
           true  => 'yes',