Fix minor bug in AutoCompleteTextView

[yadav-rahul]

This PR fixes limits maxLines in Stream's AutoCompleteTextView to 1.

• Without this property, AutoCompleteTextView can display multiple lines at a time and thus giving poor User experience.

Before

Now, it will work fine because maxLines are limited to one.

[smarx]

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[Sam1301]

hmm.. I think on small screen devices this can be a problem. @kunall17 what are your thoughts on this?

[yadav-rahul]

Actually Topic's AutoCompleteTextView already has this property(android:maxLines="1"). Implementing same in Stream's AutoCompleteTextView would look better :)

@kunall17 What are your views on it?

[yadav-rahul]

@timabbott @kunall17 Please review this PR :)

[kunall17]

Mostly the stream wouldn't be of more that 15 chars which means 2-3 lines (At the max) and by providing maxlines it would hide the text and giving 1 line more doesn't look that bad!

[timabbott]

I could imagine rebalancing a bit how much space each of stream and topic get in that line (or giving each their own line)