Changed: 'Black and White' filter to proper b&w only. No corrections, just plain greyscale.

indra/newview/app_settings/filters/BlackAndWhite.xml

 <llsd>
     <array>
-        <array>
-            <string>linearize</string>
-            <real>0.01</real>
-            <real>1.0</real>
-            <real>1.0</real>
-            <real>1.0</real>
-        </array>
-        <array>
-            <string>contrast</string>
-            <real>0.8</real>
-            <real>1.0</real>
-            <real>1.0</real>
-            <real>1.0</real>
-        </array>
         <array>
             <string>grayscale</string>
         </array>