fix placeholder size

Author: mancj

library/src/main/res/layout/searchbar.xml

@@ -53,7 +53,7 @@
                 android:fontFamily="sans-serif"
                 android:gravity="center_vertical"
                 android:maxLines="1"
-                android:textAppearance="?android:attr/textAppearanceLarge"
+                android:textAppearance="?android:attr/textAppearanceMedium"
                 android:textColor="@color/searchBarPlaceholderColor"
                 android:textStyle="bold"
                 android:visibility="visible"