Set explicit height for all media types. Audio is the only special case. (#1237)

This might FIX #1111, but I think there are actually a handful of things
breaking our layout.

// FREEBIE

Signal/src/Models/TSMessageAdapaters/TSVideoAttachmentAdapter.m

@@ -39,7 +39,6 @@
     self = [super initWithFileURL:[attachment mediaURL] isReadyToPlay:YES];
 
     if (self) {
-        ;
         _image           = attachment.image;
         _cachedImageView = nil;
         _attachmentId    = attachment.uniqueId;
@@ -200,15 +199,11 @@
 }
 
 - (CGSize)mediaViewDisplaySize {
-    CGSize mediaDisplaySize;
-    if ([self isVideo]) {
-        mediaDisplaySize = [super mediaViewDisplaySize];
-    } else if ([self isAudio]) {
     CGSize size = [super mediaViewDisplaySize];
+    if ([self isAudio]) {
         size.height = AUDIO_BAR_HEIGHT;
-        mediaDisplaySize = size;
     }
-    return mediaDisplaySize;
+    return size;
 }
 
 - (UIView *)mediaPlaceholderView {