efl.canvas.textblock: allow all white spaces in style string not just space

efl.canvas.textblock: allow all white spaces in style string not just space

Summary:
style string can contain any kind of white spaces and it will be fine

For example
```
"font=sans font_size=30 color=red "
```
Is the same as
```
"font=sans\tfont_size=30\n  color=red "
```

Reviewers: woohyun, segfaultxavi, tasn, zmike

Reviewed By: segfaultxavi

Subscribers: bu5hm4n, cedric, #reviewers, #committers

Tags: #efl

Maniphest Tasks: T8532

Differential Revision: https://phab.enlightenment.org/D11303