Add visual cue to server filter

[drzel]

open server browser
tap any letter

it will filter out servers that don't have that letter

backspace will fix this, but it isn't obvious as there is no visual queue

[niclaslindstedt]

There is a visual cue at the bottom of the page

"Searching for: test"

Though when no servers are found, that visual cue is gone.

So this fix will be to add a visual cue for when searches do not find anything.