Make default avatars clickable

BaseAvatar can be passed an onClick which is called when it's, er,
clicked, except when it was the default avatar in which case it
merrily ignored it. Make it not ignore it.

src/components/views/avatars/BaseAvatar.js

@@ -145,6 +145,21 @@ module.exports = React.createClass({
 
         if (imageUrl === this.state.defaultImageUrl) {
             const initialLetter = this._getInitialLetter(name);
+            if (onClick != null) {
+                return (
+                    <AccessibleButton element='span' className="mx_BaseAvatar"
+                        onClick={onClick} {...otherProps}
+                    >
+                        <EmojiText className="mx_BaseAvatar_initial" aria-hidden="true"
+                                style={{ fontSize: (width * 0.65) + "px",
+                                        width: width + "px",
+                                        lineHeight: height + "px" }}>{initialLetter}</EmojiText>
+                        <img className="mx_BaseAvatar_image" src={imageUrl}
+                            alt="" title={title} onError={this.onError}
+                            width={width} height={height} />
+                    </AccessibleButton>
+                );
+            } else {
                 return (
                     <span className="mx_BaseAvatar" {...otherProps}>
                         <EmojiText className="mx_BaseAvatar_initial" aria-hidden="true"
@@ -157,6 +172,7 @@ module.exports = React.createClass({
                     </span>
                 );
             }
+        }
         if (onClick != null) {
             return (
                 <AccessibleButton className="mx_BaseAvatar mx_BaseAvatar_image"