Let IME button dismiss keyboard during search (#673)

The IME search button is currently without function while the
PasswordStore SearchView is focused, which means that the keyboard
hides part of the search result until back is pressed.

This commit makes the IME button function like the back key in this
situation, dismissing the keyboard.

Co-authored-by: Harsh Shandilya <msfjarvis@gmail.com>

app/src/main/java/com/zeapo/pwdstore/PasswordStore.kt

@@ -167,6 +167,7 @@ class PasswordStore : AppCompatActivity() {
         searchView.setOnQueryTextListener(
                 object : OnQueryTextListener {
                     override fun onQueryTextSubmit(s: String): Boolean {
+                        searchView.clearFocus()
                         return true
                     }