Add minHeight for Webchat textarea

[sathianarayananh]

Problem Description
Webchat textarea element doesn't have minHeight applied in its style. This causes textarea to load with irregular size on different web pages. Because it inherits the minHeight from parent. In our site, textarea size is large enough to overflow the page size.

Fix
Add minHeight (let's say 70px) to textarea style.

_react2.default.createElement('textarea', { ref: function ref(i) { return _this3._input = i; }, value: value, style: {minHeight: 70, width: '100%', maxHeight: 70, resize: 'none' }, placeholder: 'Write a reply...', onChange: function onChange(e) { return _this3.setState({ value: e.target.value }, _this3.autoGrow); }, onKeyPress: function onKeyPress(e) { if (e.key === 'Enter') { _this3.sendMessage(); e.preventDefault(); } }, rows: 1 })

[OlivierNguyen]

Do you have an example of a website where the textarea is broken? It will help us to test the development.