Correct UI string to be "Task Pane"

Author: millerds

manifest.xml

@@ -104,7 +104,7 @@
       </bt:ShortStrings>
       <bt:LongStrings>
         <bt:String id="GetStarted.Description" DefaultValue="Your sample add-in loaded successfully. Go to the HOME tab and click the 'Show Task Pane' button to get started." />
-        <bt:String id="TaskpaneButton.Tooltip" DefaultValue="Click to Show a Taskpane" />
+        <bt:String id="TaskpaneButton.Tooltip" DefaultValue="Click to Show a Task Pane" />
       </bt:LongStrings>
     </Resources>
   </VersionOverrides>

test/end-to-end/test-manifest-debugging.xml

@@ -104,7 +104,7 @@
       </bt:ShortStrings>
       <bt:LongStrings>
         <bt:String id="GetStarted.Description" DefaultValue="Your sample add-in loaded successfully. Go to the HOME tab and click the 'Show Task Pane' button to get started." />
-        <bt:String id="TaskpaneButton.Tooltip" DefaultValue="Click to Show a Taskpane" />
+        <bt:String id="TaskpaneButton.Tooltip" DefaultValue="Click to Show a Task Pane" />
       </bt:LongStrings>
     </Resources>
   </VersionOverrides>

test/end-to-end/test-manifest.xml

@@ -68,7 +68,7 @@
       </bt:ShortStrings>
       <bt:LongStrings>
         <bt:String id="Contoso.GetStarted.Description" DefaultValue="Your sample add-in loaded successfully. Go to the HOME tab and click the 'Show Task Pane' button to get started." />
-        <bt:String id="Contoso.TaskpaneButton.Tooltip" DefaultValue="Click to Show a Taskpane" />
+        <bt:String id="Contoso.TaskpaneButton.Tooltip" DefaultValue="Click to Show a Task Pane" />
       </bt:LongStrings>
     </Resources>
   </VersionOverrides>