cgi: Fix table headers in the "Chunks" tab

This commit fixes the headers of tables shown in "Chunks" tab -- it was
was telling that tables show only regular hdd space when all the hdd
space was displayed and vice versa.

Change-Id: If9fb1e7216cbf601dc42335c0ac9da8a2c3f5dc9
cgi: Fix formatting of the "Goal definitions" table

This commit adds some padding to left-aligned cells in this table to
make the table more readable.

Change-Id: I93bdf3d48702fb000b13e68dff67db0f3246f120