Ride-Details - 'Extra' Tab - Text Field 'Read Only' only

... be less restrictive for 'TextEdit' and 'LineEdit' field, jus set
'Read Only' to still allow mainly scrolling (which is otherwise blocked)

... mainly for 'Change Log'  and 'Calendar Text'
Merge pull request #992 from Joern-R/pull3

Ride-Details - 'Extra' Tab - Text Fields 'Read Only' only