test: compare whole string not first char in NoteEditor test

this test is marked flaky so it won't ever run in CI but it was
failing locally for me every time as it was comparing the first
char of the string it pulled to a string, instead of string vs string

AnkiDroid/src/androidTest/java/com/ichi2/anki/NoteEditorIntentTest.kt

@@ -58,7 +58,7 @@ class NoteEditorIntentTest : InstrumentedTest() {
             val editor = activity.getEditor()
             currentFieldStrings = editor.currentFieldStrings[0]
         }
-        MatcherAssert.assertThat(currentFieldStrings!![0], Matchers.equalTo("sample text"))
+        MatcherAssert.assertThat(currentFieldStrings!!, Matchers.equalTo("sample text"))
     }
 
     @Test