Prevent a world height of 0 from being set

macrovision.html

@@ -25,7 +25,7 @@
   <div id="main-area">
     <div id="options">
       <div class="option-row">
-        <input type="number" id="options-height-value" value="10">
+        <input type="number" id="options-height-value" min="1" value="10">
         <select id="options-height-unit">
           <option>meters</option>
           <option>kilometers</option>

macrovision.js

@@ -264,7 +264,7 @@ document.addEventListener("mousemove", (e) => {
 });
 
 function updateWorldHeight() {
-    const value = document.querySelector("#options-height-value").value;
+    const value = Math.max(1, document.querySelector("#options-height-value").value);
     const unit = document.querySelector("#options-height-unit").value;
     const oldHeight = config.height;