Fix to correct date/time in Versions modal which displays the Version UTC date/time directly from the database, and does not correct it with Server Time Zone and/or User Time Zone.

Test:

• Configure different Time Zone settings for Server & User (to notice differences from UTC timezone that is used in Joomla's database)
  Local Server Time: Sat 2015-01-17 00:48 (UTC+1)
  System > Global Configuration > Server Time Zone: e.g. Amsterdam (= UTC+1)
  Users > User Manager > select user account > Basic Settings > e.g. New York (= UTC-5)

• Create an article, and change it
  Content > Article Manager > New > "Some title" > Save
  Created Date = 2015-01-16 18:48:48 ( -> displayed in Timezone of User)

Changed Article a bit > Save
Created Date = 2015-01-16 18:48:48 (= UTC-5)
Modified Date = 2015-01-16 18:50:44 (= UTC-5)

In database the article is stored in UTC time:
created: 2015-01-16 23:48:48 ( = UTC time)
modified: 2015-01-16 23:50:44 (= UTC time)

• Use [Versions] button to see the date/time in Versions Modal. In Versions the time is displayed as UTC time: current version: 2015-01-16 23:50:44 ( = UTC time, directly from database) 1st version 2015-01-16 23:48:48 ( = UTC time, directly from database)

This PR fixes the date/time in Versions Modal with Global Timezone setting, and if set User Timezone setting:

Note: I have added this PR before: #3355
I could not correct it in the model /administrator/components/com_contenthistory/models/history.php and therefore correcting it in the view seems like the best alternative.