Fix url preview sizing

vector/src/main/java/im/vector/app/features/home/room/detail/timeline/view/TimelineMessageLayoutRenderer.kt

@@ -21,4 +21,6 @@ interface MessageViewConfiguration {
     var isFirstFromSender: Boolean
     var isLastFromSender: Boolean
     var showTimeAsOverlay: Boolean
+    var showNoBubble: Boolean
+    fun render()
 }

vector/src/main/res/layout/view_url_preview.xml

@@ -9,6 +9,7 @@
     <LinearLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
+        android:minWidth="@dimen/chat_bubble_fixed_size"
         android:orientation="vertical">
 
         <ImageView
@@ -17,6 +18,7 @@
             android:layout_height="wrap_content"
             android:adjustViewBounds="true"
             android:importantForAccessibility="no"
+            android:layout_gravity="center"
             android:maxHeight="200dp"
             android:scaleType="fitXY"
             tools:src="@tools:sample/backgrounds/scenic" />