Patch to fix Heapstatus on Darktheme. (See screenshot)
- In Heapstatus, foreground color of text was not set properly.
- In e4-dark, heapstatus colors were not defined leading 
  to unsuitable defaults.

Change-Id: I7dbd5ce122dd53aa818d201b419a50deb154ac02
Signed-off-by: Leo Ufimtsev <lufimtse@redhat.com>