Adding one condition to improve stereo covering

Lost coverage [lines, functions]:

Added coverage [lines, functions]:
bits_alloc.c: [1422]
ivas_cpe_dec.c: [938, 939]
ivas_cpe_enc.c: [1125, 1126]
ivas_stereo_classifier.c: [584]
ivas_stereo_dft_dec.c: [3156]
ivas_stereo_ica_enc.c: [102, 103, 623, 674, 675, 745, 746, 1076, 1104, 1105, 1113, 1114, 1147, 1162]
ivas_stereo_icbwe_enc.c: [512, 513, 655]
ivas_stereo_td_analysis.c: ['stereo_tdm_ener_analysis_SM', 226, 330, 336, 389, 497, 499, 500, 501, 502, 503, 504, 505, 506, 507, 509, 510, 511, 512, 513, 514, 515, 518, 668, 677, 679, 680, 682, 683, 747, 748, 750, 773, 775, 785, 786, 787, 789, 957, 959, 961, 963, 965, 967, 969, 971, 973, 977, 982, 1034, 1045, 1047, 1050, 1057, 1063, 1074, 1078, 1087, 1090, 1097, 1099, 1101, 1105, 1107, 1108, 1110, 1111, 1113, 1118, 1123, 1125, 1126, 1128, 1132, 1138, 1141, 1143, 1145, 1146, 1148, 1150, 1151, 1155, 1157, 1159, 1167, 1169, 1170, 1173, 1175, 1178, 1179, 1181, 1370, 1372, 1373, 1374, 1375, 1376, 1377, 1422, 1441, 1442, 1456]
ivas_stereo_td_bit_alloc.c: [176, 679]
ivas_stereo_td_dec.c: [315, 317, 318, 360, 362, 363, 364, 365, 370, 372, 373, 374, 375, 450, 452, 456, 473, 476, 479, 482, 484, 485, 488, 491, 493, 497, 498, 501]
ivas_stereo_td_enc.c: [416, 513, 730, 732, 736, 753, 756, 759, 761, 762, 765, 767, 771, 772, 775]
qlpc_stoch.c: [287]