tests: net: sockets: tls: Increase connect timeout

Since fc007eee TLS sockets support
timeout based on CONFIG_NET_SOCKETS_CONNECT_TIMEOUT value. The TLS test
suite reduced this config value to speed up the tests, however it turns
out the 100ms timeout is too low to finalize the handshake on slower
platforms (nrf52840 specifically). Therefore increase the timeout value
to 200ms to prevent test failures on those.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>