Fix bad colors in TUI output - part 2 (#2782)

pygments emits a sequence resetting both the foreground and background color at the same time using one sequence `\x1b[39;49m`.

Refs #2654 #2764

pwndbg/gdblib/tui/context.py

@@ -202,6 +202,7 @@ class ContextTUIWindow:
             )
             .replace("\x1b[39m", "\x1b[0m")
             .replace("\x1b[49m", "\x1b[0m")
+            .replace("\x1b[39;49m", "\x1b[0m")
         )