a few svg fixes

build/svg/ox.ui.classic/symbolAdd.svg

@@ -1,6 +1,6 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="256" height="256">
     <g stroke="#404040" stroke-width="48">
-        <line x1="128" y1="0" x2="128" y2="256"/>
-        <line x1="0" y1="128" x2="256" y2="128"/>
+        <line x1="128" y1="16" x2="128" y2="240"/>
+        <line x1="16" y1="128" x2="240" y2="128"/>
     </g>
 </svg>

build/svg/ox.ui.classic/symbolDown.svg

@@ -1,3 +1,3 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="256" height="256">
-    <polygon points="32,56 224,56 128,248" fill="#404040"/>
+    <polygon points="32,48 224,48 128,240" fill="#404040"/>
 </svg>

build/svg/ox.ui.classic/symbolRemove.svg

@@ -1,5 +1,3 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="256" height="256">
-    <g stroke="#404040" stroke-width="48" stroke-linecap="round">
-        <line x1="0" y1="128" x2="256" y2="128"/>
-    </g>
+    <line x1="16" y1="128" x2="240" y2="128" stroke="#404040" stroke-width="48"/>
 </svg>

build/svg/ox.ui.classic/symbolUp.svg

@@ -1,3 +1,3 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="256" height="256">
-    <polygon points="32,200 128,8 224,200" fill="#404040"/>
+    <polygon points="32,208 128,16 224,208" fill="#404040"/>
 </svg>