CSS Fix for ExtJS

Unfortunately the 'line-height' within #content of some skins interfere
with ExtJS stylings. This change adds just another selector to Markus
Glaser's fix

Also: Some whitespace changes on BSMigrationHelper caused by review with
save

Change-Id: I35d53f506f1a6f06a5643d9b14e67af574b8e638
Merge "CSS Fix for ExtJS"