Change variable names to be clearer

js/mixins/form.js

@@ -9,7 +9,7 @@ export default {
       if (typeof this[name] !== undefined) {
         this[name] = value
         if (event['parent_uid'] === this._uid) {
-          this.disabled = false
+          this.changed = true
         }
       }
     },
@@ -17,14 +17,14 @@ export default {
 
   data: function() {
     return {
-      disabled: this.disableSave,
+      changed: this.hasChanges,
     }
   },
 
   props: {
-    disableSave: {
+    hasChanges: {
       type: Boolean,
-      default: true,
+      default: false,
     },
   },
 }

templates/components/save_button.html

@@ -1,6 +1,6 @@
 {% macro SaveButton(text, additional_classes="") -%}
   {% set class = "usa-button usa-button-primary" + additional_classes %}
-  <button type="submit" class="{{ class }}" tabindex="0" v-bind:disabled="disabled">
+  <button type="submit" class="{{ class }}" tabindex="0" v-bind:disabled="!changed">
     {{ text }}
   </button>
 {%- endmacro %}