Add show all / reset button on detect params (#184)

Closes: #183

Signed-off-by: Justin Georgi <justin.georgi@gmail.com>

Reviewed-on: #184

src/pages/help.vue

@@ -41,7 +41,8 @@
         This button will make three tools available:
       </p>
       <ol>
-        <li>Confidence slider: You can use the slider to change the confidence threshold for identifying structures. The default threshold is 50% confidence.</li>
+        <li>Confidence filter <SvgIcon icon="visibility" class="list-svg"/> or <SvgIcon icon="reset_slide" class="list-svg"/>: You can press this button to show all structures or return the confidence slider to the default value (50%).</li>
+        <li>Confidence slider: You can use the slider to change the confidence threshold for identifying structures.</li>
         <li>Refresh detections <SvgIcon icon="refresh_search" class="list-svg"/>: If there has been a permanent change to the structure detection list, such as deleting a tag, the detection list can be reset to its original state.</li>
         <li>Structure list <SvgIcon icon="check_list" class="list-svg"/>: you can view a list of all the structures available for detection in that region and select/deselect individual structures for detection.</li>
       </ol>