Updates Superpolator file and deletes extra designspace files.

RomanMasters/SourceCodePro.sp3

@@ -28,7 +28,6 @@
         <provideGroups state="1"/>
         <provideLib state="1"/>
         <provideInfo state="1"/>
-        <maskedfont kerning="1"/>
     </master>
     <!-- masks -->
     <master familyname="Source Code Pro" filename="SourceCodePro_2.ufo" sortorder="2" stylename="Master2">
@@ -36,7 +35,6 @@
             <dimension name="weight" xvalue="1000.000000"/>
         </location>
         <color a="1.000" b="0.000" g="1.000" r="0.000"/>
-        <maskedfont kerning="1"/>
     </master>
     <!-- masks -->
     <master familyname="Source Code Pro" filename="SourceCodePro_1.ufo" sortorder="1" stylename="Master1">
@@ -1457,7 +1455,6 @@
         <maskedglyph name="zhedescender"/>
         <maskedglyph name="zlinebelow"/>
         <maskedglyph name="zretroflex"/>
-        <maskedfont kerning="1"/>
     </master>
     <!-- instance definitions -->
     <instance familyname="Source Code Pro" filename="SP3instances/SourceCodePro-ExtraLight.ufo" sortorder="3" stylename="ExtraLight">