Make Electrum tests pass after bump to 2.6.3-1.

The new version decreases the size of the seed text box (the old image
expects a larger one), and it is not focused by default. Furthermore,
there seems to be a race between the where Sikuli could detect the old
text box after clicking next, so let's properly wait for the
verification window.

features/step_definitions/electrum.rb

@@ -23,7 +23,8 @@ When /^I create a new bitcoin wallet$/ do
   @screen.type('c', Sikuli::KeyModifier.CTRL) # copy seed to clipboard
   seed = $vm.get_clipboard
   @screen.wait_and_click("ElectrumNextButton.png", 15)
-  @screen.wait("ElectrumWalletSeedTextbox.png", 15)
+  @screen.wait("ElectrumSeedVerificationPrompt.png", 15)
+  @screen.click("ElectrumWalletSeedTextbox.png", 15)
   @screen.type(seed) # Confirm seed
   @screen.wait_and_click("ElectrumNextButton.png", 10)
   @screen.wait_and_click("ElectrumEncryptWallet.png", 10)