searchBar: set the text color to default

GitLab: #1566
Change-Id: If9bad187274946e7df5cf7a50501067183f4f7c4

jami-android/app/src/main/res/layout/frag_home.xml

@@ -142,7 +142,6 @@ along with this program; if not, write to the Free Software
                         android:layout_gravity="center"
                         android:drawablePadding="8dp"
                         android:text="@string/new_swarm"
-                        android:textColor="@color/colorPrimary"
                         android:textSize="@dimen/text_size_large"
                         app:drawableStartCompat="@drawable/baseline_group_add_24"
                         app:drawableTint="@color/icon_color" />