Distance to move needs to stay a double

When multiplying the delta to the nudge, it was saving the result
into the integer delta, removing all precision from the nudge value.

Fixes https://gitlab.com/inkscape/inkscape/-/issues/5308

src/ui/tools/select-tool.cpp

@@ -833,9 +833,9 @@ bool SelectTool::root_handler(CanvasEvent const &event)
 
             bool const rotated = prefs->getBool("/options/moverotated/value", true);
 
-            int delta = 1;
+            double delta = 1.0;
             if (mod_shift(event)) { // shift
-                delta = 10;
+                delta = 10.0;
             }
 
             bool screen = true;