fix: remove duplicated search button on "search in chat"

[Simon-Laux]

fixes #3014

and more compact design:

[r10s]

is it understandable that you need to press the small x to exit search?

i think, this is already a huge improvement to the state before, where you had to tap the second "X" to exit the search-in-chat mode:

requiring to tap the second "X" was more irritating :)

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as real "tag chips" are out of scope, and maybe also not needed, as a further improvements, what comes to my mind:

• the repetition of the chat name and the chat avatar is superfluous - and also looks like a search result; better remove it

• the "Search in Chat" subtitle can stay, however, it could also be combined with the "123 Messages" (or use it as placeholder?)

• the immediately appearing "error" of "0 Messages found" before even typing something could maybe just be removed (once there are result or if really nothing is found, the title should appear, of course)

[r10s]

i think, this is an improvement - it is definitely easier for the user to exit search-in-chat