Make the home icon in the breadcrumbs slightly larger

Also remove unnecessary use of prototype

src/pyj/book_list/search.pyj

@@ -210,7 +210,7 @@ class SearchPanel:
             if item:
                 li.appendChild(E.span(item.name))
             else:
-                li.appendChild(svgicon('home'))
+                li.appendChild(svgicon('home', '2.2ex', '2.2ex'))
 
         create_breadcrumb()
         parent = self.tag_browser_data

src/pyj/dom.pyj

@@ -67,9 +67,9 @@ def create_keyframes(animation_name, *frames):
         ans.push('}')
     return ans.join('\n') + '\n'
 
-def svgicon(name):
+def svgicon(name, height, width):
     ans = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
-    ans.setAttribute('style', 'fill: currentColor; height: 2ex; width: 2ex; vertical-align: text-top')
+    ans.setAttribute('style', 'fill: currentColor; height: {}; width: {}; vertical-align: text-top'.format(height ? '2ex', width ? '2ex'))
     u = document.createElementNS('http://www.w3.org/2000/svg', 'use')
     u.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href', '#icon-' + name)
     ans.appendChild(u)

src/pyj/utils.pyj

@@ -35,7 +35,7 @@ def parse_url_params(url=None, allow_multiple=False):
         key, val = pair.partition('=')[::2]
         key, val = decodeURIComponent(key), decodeURIComponent(val)
         if allow_multiple:
-            if not Object.prototype.hasOwnProperty.call(ans, key):
+            if ans[key] is undefined:
                 ans[key] = []
             ans[key].append(val)
         else:

src/pyj/widgets.pyj

@@ -95,5 +95,5 @@ def get_widget_css():
     ans = 'a, button:focus { outline: none }; a, button::-moz-focus-inner { border: 0 }\n'
     ans += create_button.style
     ans += create_spinner.style
-    ans += Breadcrumbs.prototype.STYLE_RULES
+    ans += Breadcrumbs.STYLE_RULES
     return ans