fix: do not send `"pay": false` in  InlineKeyboardButton

… of the data'

@okman334 reported an error when using the curl HTTP client after commit
775291f ("net: Allow curl handle in CurlHttpClient to be kept alive"):

   error: curl error: Send failed since rewinding of the data stream failed.

Fix this by calling `curl_easy_reset()` before setting curl options. It
reinitializes all options previously set on a specified curl handle to
the default values while keeping the connection alive.

Also, move the timeout options setting below the reset call to avoid
losing the timeout options effect.

Closes: #340
Reported-by: @okman334
Fixes: 775291f ("net: Allow curl handle in CurlHttpClient to be kept alive")
Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>

[GIT PULL] net: CurlHttpClient: Call `curl_easy_reset()` to fix error 'rewinding of the data'