Remove sound sample rate indicator

It reflects the sample rate of your computer, not the sound,
so it is misleading at best.

Author: GarboMuffin

src/components/sound-editor/sound-editor.jsx

@@ -361,8 +361,6 @@ const SoundEditor = props => (
                 {formatDuration(props.playhead, props.trimStart, props.trimEnd, props.duration)}
             </div>
             <div className={styles.advancedInfo}>
-                {props.sampleRate}
-                {'Hz '}
                 {props.isStereo ? (
                     <FormattedMessage
                         defaultMessage="Stereo"
@@ -405,7 +403,6 @@ SoundEditor.propTypes = {
     isStereo: PropTypes.bool.isRequired,
     duration: PropTypes.number.isRequired,
     size: PropTypes.number.isRequired,
-    sampleRate: PropTypes.number.isRequired,
     canPaste: PropTypes.bool.isRequired,
     canRedo: PropTypes.bool.isRequired,
     canUndo: PropTypes.bool.isRequired,

src/containers/sound-editor.jsx

@@ -441,7 +441,6 @@ class SoundEditor extends React.Component {
                 isStereo={this.props.isStereo}
                 duration={this.props.duration}
                 size={this.props.size}
-                sampleRate={this.props.sampleRate}
                 canPaste={this.state.copyBuffer !== null}
                 canRedo={this.redoStack.length > 0}
                 canUndo={this.undoStack.length > 0}