Update test and rename customSignalsMap to customSignals

Author: tusharkhandelwal8

firebase-config/src/main/java/com/google/firebase/remoteconfig/FirebaseRemoteConfig.java

@@ -658,15 +658,15 @@ private Task<Void> setDefaultsWithStringsMapAsync(Map<String, String> defaultsSt
    * <p>The {@code customSignals} parameter should be an instance of {@link CustomSignals}, which
    * enforces the allowed types for custom signal values (String, Long or Double).
    *
-   * @param customSignalsMap A dictionary of keys and the values of the custom signals to be set for
+   * @param customSignals A dictionary of keys and the values of the custom signals to be set for
    *                         the app instance
    */
   @NonNull
-  public Task<Void> setCustomSignals(@NonNull CustomSignals customSignalsMap) {
+  public Task<Void> setCustomSignals(@NonNull CustomSignals customSignals) {
     return Tasks.call(
         executor,
         () -> {
-          frcSharedPrefs.setCustomSignals(customSignalsMap.customSignals);
+          frcSharedPrefs.setCustomSignals(customSignals.customSignals);
           return null;
         });
   }

firebase-config/src/test/java/com/google/firebase/remoteconfig/internal/ConfigSharedPrefsClientTest.java

@@ -374,10 +374,10 @@ public void getCustomSignals_isSet_returnsCustomSignals() {
   @Test
   public void setCustomSignals_multipleTimes_addsNewSignals() {
     Map<String, String> signals1 = ImmutableMap.of("subscription", "premium");
-    Map<String, String> signals2 = ImmutableMap.of("age", "20");
+    Map<String, String> signals2 = ImmutableMap.of("age", "20", "subscription", "basic");
     sharedPrefsClient.setCustomSignals(signals1);
     sharedPrefsClient.setCustomSignals(signals2);
-    Map<String, String> expectedSignals = ImmutableMap.of("subscription", "premium", "age", "20");
+    Map<String, String> expectedSignals = ImmutableMap.of("subscription", "basic", "age", "20");
     assertThat(sharedPrefsClient.getCustomSignals()).isEqualTo(expectedSignals);
   }