Shrink font size in compose message box.

This decreases the font size in chatbox.xml.

Fixes #177.

Author: minervapanda

app/src/main/res/layout/chatbox.xml

@@ -53,7 +53,8 @@
             android:layout_weight="1"
             android:hint="@string/tap_message"
             android:inputType="textCapSentences|textMultiLine"
-            android:maxLines="4" />
+            android:maxLines="4"
+            android:textSize="15sp" />
 
         <ImageView
             android:id="@+id/send_btn"
@@ -88,4 +89,4 @@
     </LinearLayout>
 
 
-</merge>
+</merge>