Remove deprecated ApproxLastUsed field of profile

profile/profile.go

@@ -101,10 +101,6 @@ type Profile struct { //nolint:maligned // not worth the effort
 	// path.
 	Config map[string]interface{}
 
-	// ApproxLastUsed holds a UTC timestamp in seconds of
-	// when this Profile was approximately last used.
-	// For performance reasons not every single usage is saved.
-	ApproxLastUsed int64
 	// LastEdited holds the UTC timestamp in seconds when the profile was last
 	// edited by the user. This is not set automatically, but has to be manually
 	// set by the user interface.