[INTERNAL] sap.m.Textarea: Styles improvement
[INTERNAL] sap.m.Textarea: Styles improvement

- The text of the counter has the desired
color now, not the one inherited from sap.m.Text
- The visual distance between the textarea and
the counter is corrected.

JIRA: BGSOFUIRILA-2312
Change-Id: I6581450906f29d8cbad3a59d5579da523cfc503b

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5