Fix the Open button in the dialog to be enabled after a Choose file, and on paste. r=ben

xpfe/browser/resources/content/openLocation.js

@@ -131,4 +131,6 @@ function onChooseFile()
     }
 
   } catch(ex) { }
+  
+  doEnabling();  
 }

xpfe/browser/resources/content/openLocation.xul

@@ -51,7 +51,6 @@
                    
   <keyset id="keyset"/>
            
-  <!-- spank me -->		
   <box>
     <box orient="vertical">
       <image class="question-icon"/>
@@ -63,7 +62,7 @@
 
       <box autostretch="never">
         <!-- spank me -->
-        <textfield id="dialog.input" flex="1" onkeyup="doEnabling();"/>
+        <textfield id="dialog.input" flex="1" oninput="doEnabling();"/>
         <button value="&chooseFile.label;" onclick="onChooseFile();"/>
       </box>
       <box autostretch="never" valign="center">