Revert "Set ansi spans to inline-block display"

This reverts commit d6fe29968927bc3b66f557a1e59c41df4e262e90.

packages/rendermime/style/base.css

@@ -38,10 +38,6 @@
 }
 
 /* console foregrounds and backgrounds */
-.jp-RenderedText pre span {
-  display: inline-block;
-}
-
 .jp-RenderedText pre .ansi-black-fg {
   color: #3e424d;
 }