Shrink max display width of topics.

This fixes an issue with topic names overlapping in the left sidebar.
While we're doing that, it makes sense to shrink the maximum size of
the topic input box, to discourage sending with topics that will be
cut off.

static/styles/compose.css

@@ -329,6 +329,7 @@ input.recipient_box {
 #subject.recipient_box {
     width: calc(20% + 14px);
     min-width: 140px;
+    max-width: 165px;
 }
 
 #stream.recipient_box.lock-padding {

static/styles/left-sidebar.css

@@ -193,7 +193,7 @@ li.hidden-filter {
     display: block;
     line-height: 1.3em;
     width: 100%;
-    max-width: 170px;
+    max-width: 158px;
     white-space: nowrap;
     overflow: hidden;
     text-overflow: ellipsis;