[openstreetmap/openstreetmap-website] Right click and selecting "Directions to here" can unintuitively blank the directions "From" text box (#1684)

[aftertea]

When a user searches for a location (i.e. Big Ben), clicks Directions, and then selects the second point for the directions to route, it forgets the initially selected location. 

**Replication steps** 

1. On https://www.openstreetmap.org in the search bar search for a location (i.e Big Ben)
2. Press the Directions button to the right of the search bar. 
-- "From" is now populated with the address of Big Ben, URL is [this](https://www.openstreetmap.org/directions?from=Big%20Ben#map=19/51.50069/-0.12411)
3. On the map, right click any location and select "Directions to here"

**Actual Result**

- Big Ben is removed from the "From" text box. 
- Location clicked on the map is entered into "To" text box


**Expected result**

- Big Ben remains in the "From" text box. 
- Location clicked on the map is entered into "To" text box

**Note**

Its possible that the real bug here is that the initial clicking of "Directions" should populate the "To" text box, instead of the "From"

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/1684
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