Position rotated labels more carefully in the physical center of the

road. This especially fixes vertical roads. #799

Verified manually by screenshot diffs

data/MANIFEST.json

@@ -796,9 +796,9 @@
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@@ -1576,9 +1576,9 @@
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@@ -2121,9 +2121,9 @@
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@@ -2426,19 +2426,19 @@
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map_gui/src/render/road.rs

@@ -102,7 +102,7 @@ impl DrawRoad {
                         txt.render_autocropped(prerender)
                             .scale(0.1)
                             .centered_on(pt)
-                            .rotate(angle.reorient()),
+                            .rotate_around_batch_center(angle.reorient()),
                     );
                 }
             }