#5647 Add Candidate -. Contact no should be validated as follow

[nilanga Nayanajith]

Version : OrangeHRM 2.6.8/2.6.9

Description : Contact No should be validated as follow:
1. should start with +,- or a digit
2. can contain numbers, hyphen, spaces in between first and last values of the contact No field
3. Should end with a number.