Fix UI issue. reviewed by redding.

@@ -54,7 +54,7 @@ export default class SubjectPost extends Component {
                             }
                         }}
                     />
-                    <Text style={[styles.submitText, {color:this.props.replyTextColor}]} onPress={this.props.commitComment}>发送</Text>
+                    <Text style={[styles.submitText, {color:this.props.replyTextColor, borderColor: this.props.replyTextColor}]} onPress={this.props.commitComment}>发送</Text>
                 </View>
                 <View style={styles.toolTopLine}/>
                 <View style={styles.toolBottomLine}/>