health: calculate distance from steps

Simplify stride length setting, remove locale

apps/health/settings.js

@@ -9,7 +9,6 @@
     require("Storage").writeJSON("health.json", settings);
   }
 
-  function settingsMenu() {
   E.showMenu({
     "": { title: /*LANG*/"Health Tracking" },
 
@@ -51,42 +50,14 @@
       }
     },
 
-      /*LANG*/"Stride length": () => strideLengthMenu()
-    });
-  }
-
-  function strideLengthMenu() {
-    const menu = {
-      "" : { title : /*LANG*/"Stride length" },
-
-      "< Back" : () => {
-        setSettings();
-        settingsMenu();
-      },
-
-      "x 0.01" : {
-        value : settings.strideLength === undefined ? 0 : settings.strideLength,
-        min:0,
+    /*LANG*/"Stride length": {
+      value : settings.strideLength || 0.0,
+      min:0.01,
       step:0.01,
-        format: v => require("locale").distance(v, 2),
       onchange : v => {
         settings.strideLength=v;
-          menu["x 0.1"].value = v;
+        setSettings();
       },
     },
-      "x 0.1" : {
-        value : settings.strideLength === undefined ? 0 : settings.strideLength,
-        min:0,
-        step:0.1,
-        format: v => require("locale").distance(v, 2),
-        onchange : v => {
-          settings.strideLength=v;
-          menu["x 0.01"].value = v;
-        },
-      },
-    };
-    E.showMenu(menu);
-  }
-
-  settingsMenu();
+  });
 })