tabline: do not confuse Vim

looks like this:
```
let a=(condition ? s:var:'')
```
confuses older Vims and it complains about a missing colon. So make
parsing a bit easier and add a space in front of the second colon.

fixes #1629
This commit is contained in:
Christian Brabandt 2018-01-08 13:46:08 +01:00
parent 02816a3cb6
commit 9a2ed35ff9
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