Settings: Fix assertThat in test

Truth.assertThat is a fluent-style API. Fix the tests to actually
do something.

Found by errorprone.

Bug: 73513670
Test: m RunSettingsRoboTests
Test: m javac-check RUN_ERROR_PRONE=true
Change-Id: I032f6741ac0c728781a9d22ab6158e7b74a30167

tests/robotests/src/com/android/settings/bluetooth/BluetoothPairingDialogTest.java

@@ -155,7 +155,7 @@ public class BluetoothPairingDialogTest {
 
         // check that showSoftInput was called to make input method appear when the dialog was shown
         assertThat(view.isFocused()).isTrue();
-        assertThat(imm.isActive());
+        assertThat(imm.isActive()).isTrue();
         verify(imm).showSoftInput(view, InputMethodManager.SHOW_IMPLICIT);
     }