Sync with upstream alchemy in removing the Lag Meter Floater

Useless floater, full of opensim drama we'll have no part in.

indra/newview/app_settings/settings_ascent.xml

@@ -1538,17 +1538,6 @@
       <key>Value</key>
       <boolean>0</boolean>
     </map>
-    <key>ToolbarVisibleLagMeter</key>
-    <map>
-      <key>Comment</key>
-      <string>Whether or not the button for lag meter is on the toolbar</string>
-      <key>Persist</key>
-      <integer>1</integer>
-      <key>Type</key>
-      <string>Boolean</string>
-      <key>Value</key>
-      <boolean>0</boolean>
-    </map>
     <key>ToolbarVisibleLocalAssets</key>
     <map>
       <key>Comment</key>