cp_als: align output formatting to Matlab version

[dmdunla]

Current output:

CP_ALS:
 Iter 0: f = 0.29487863930212066 f-delta = 0.29487863930212066
 Iter 1: f = 0.29566273499455864 f-delta = 0.0007840956924379805
 Iter 2: f = 0.29598343630628876 f-delta = 0.0003207013117301205
 Iter 3: f = 0.29617630790336913 f-delta = 0.0001928715970803685
 Iter 4: f = 0.29631901697531704 f-delta = 0.00014270907194791072
 Iter 5: f = 0.2964251708541269 f-delta = 0.00010615387880985594
 Iter 6: f = 0.2965041651264738 f-delta = 7.899427234692169e-05
 Final f = 0.29650416512647393

Matlab output:

CP_ALS:
 Iter  1: f = 2.948786e-01 f-delta = 2.9e-01
 Iter  2: f = 2.956627e-01 f-delta = 7.8e-04
 Iter  3: f = 2.959834e-01 f-delta = 3.2e-04
 Iter  4: f = 2.961763e-01 f-delta = 1.9e-04
 Iter  5: f = 2.963190e-01 f-delta = 1.4e-04
 Iter  6: f = 2.964252e-01 f-delta = 1.1e-04
 Iter  7: f = 2.965042e-01 f-delta = 7.9e-05
 Final f = 2.965042e-01