help: Add white background to icons for dark mode

help/C/figures/edit-copy-symbolic.svg

@@ -1,4 +1,5 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<svg height="16px" viewBox="0 0 16 16" width="16px" xmlns="http://www.w3.org/2000/svg">
-    <path d="m 0 3 c 0 -1.644531 1.355469 -3 3 -3 h 5 c 1.644531 0 3 1.355469 3 3 c 0 0.550781 -0.449219 1 -1 1 s -1 -0.449219 -1 -1 c 0 -0.570312 -0.429688 -1 -1 -1 h -5 c -0.570312 0 -1 0.429688 -1 1 v 5 c 0 0.570312 0.429688 1 1 1 c 0.550781 0 1 0.449219 1 1 s -0.449219 1 -1 1 c -1.644531 0 -3 -1.355469 -3 -3 z m 5 5 c 0 -1.644531 1.355469 -3 3 -3 h 5 c 1.644531 0 3 1.355469 3 3 v 5 c 0 1.644531 -1.355469 3 -3 3 h -5 c -1.644531 0 -3 -1.355469 -3 -3 z m 2 0 v 5 c 0 0.570312 0.429688 1 1 1 h 5 c 0.570312 0 1 -0.429688 1 -1 v -5 c 0 -0.570312 -0.429688 -1 -1 -1 h -5 c -0.570312 0 -1 0.429688 -1 1 z m 0 0" fill="#2e3436"/>
+<svg xmlns="http://www.w3.org/2000/svg" height="20" viewBox="0 0 20 20" width="20" version="1.1" id="svg1">
+  <defs/>
+  <path id="rect1" fill="#ffffff" d="M1.368,0 L18.632,0 A1.368 1.368 0 0 1 20,1.368 L20,18.632 A1.368 1.368 0 0 1 18.632,20 L1.368,20 A1.368 1.368 0 0 1 0,18.632 L0,1.368 A1.368 1.368 0 0 1 1.368,0 Z"/>
+  <path id="path1" fill="#2e3436" d="M2,5 C2,3.355 3.355,2 5,2 L10,2 C11.645,2 13,3.355 13,5 C13,5.551 12.551,6 12,6 C11.449,6 11,5.551 11,5 C11,4.43 10.57,4 10,4 L5,4 C4.43,4 4,4.43 4,5 L4,10 C4,10.57 4.43,11 5,11 C5.551,11 6,11.449 6,12 C6,12.551 5.551,13 5,13 C3.355,13 2,11.645 2,10 Z M7,10 C7,8.355 8.355,7 10,7 L15,7 C16.645,7 18,8.355 18,10 L18,15 C18,16.645 16.645,18 15,18 L10,18 C8.355,18 7,16.645 7,15 Z M9,10 L9,15 C9,15.57 9.43,16 10,16 L15,16 C15.57,16 16,15.57 16,15 L16,10 C16,9.43 15.57,9 15,9 L10,9 C9.43,9 9,9.43 9,10 Z"/>
 </svg>