Refactor all Buefy form submit buttons, per Chrome behavior

ugh, what a pain.  and turns out i'd previously ran into this same issue for
jQuery, per commit e945ebe325

tailbone/static/js/tailbone.buefy.oncebutton.js

@@ -1,21 +1,19 @@
 
 const OnceButton = {
 
-    template: [
-        '<b-button',
-        ':type="type"',
-        ':native-type="nativeType"',
-        ':tag="tag"',
-        ':href="href"',
-        ':title="title"',
-        ':disabled="buttonDisabled"',
-        '@click="clicked"',
-        'icon-pack="fas"',
-        ':icon-left="iconLeft"',
-        '>',
-        '{{ buttonText }}',
-        '</b-button>'
-    ].join(' '),
+    template: `
+        <b-button :type="type"
+                  :native-type="nativeType"
+                  :tag="tag"
+                  :href="href"
+                  :title="title"
+                  :disabled="buttonDisabled"
+                  @click="clicked"
+                  icon-pack="fas"
+                  :icon-left="iconLeft">
+          {{ buttonText }}
+        </b-button>
+        `,
 
     props: {
         type: String,