Fixed incorrect speaker counts in the metadata

The old speaker limit seemed to have been missing or something, but the numbers that appeared in the metadata were way higher than they should've been

AMI/ls_eend_ami_step.json

@@ -14,6 +14,7 @@
   "input_dim": 345,
   "key_dim": 64,
   "max_nspks": 6,
+  "max_speakers": 4,
   "mixed_fp16_exclude_markers": [
     "model.dec.",
     "dec_ret",
@@ -29,7 +30,7 @@
     "enc_ret_",
     "enc_conv_cache"
   ],
-  "n_fft": 256,
+  "n_fft": 1024,
   "n_mels": 23,
   "num_heads": 4,
   "real_output_dim": 4,

CALLHOME/ls_eend_callhome_step.json

@@ -14,6 +14,7 @@
   "input_dim": 345,
   "key_dim": 64,
   "max_nspks": 9,
+  "max_speakers": 7,
   "mixed_fp16_exclude_markers": [
     "model.dec.",
     "dec_ret",
@@ -29,7 +30,7 @@
     "enc_ret_",
     "enc_conv_cache"
   ],
-  "n_fft": 256,
+  "n_fft": 1024,
   "n_mels": 23,
   "num_heads": 4,
   "real_output_dim": 7,

DIHARD II/ls_eend_dih2_step.json

@@ -14,6 +14,7 @@
   "input_dim": 345,
   "key_dim": 64,
   "max_nspks": 12,
+  "max_speakers": 10,
   "mixed_fp16_exclude_markers": [
     "model.dec.",
     "dec_ret",
@@ -29,7 +30,7 @@
     "enc_ret_",
     "enc_conv_cache"
   ],
-  "n_fft": 256,
+  "n_fft": 1024,
   "n_mels": 23,
   "num_heads": 4,
   "real_output_dim": 10,

DIHARD III/ls_eend_dih3_step.json

@@ -14,6 +14,7 @@
   "input_dim": 345,
   "key_dim": 64,
   "max_nspks": 12,
+  "max_speakers": 10,
   "mixed_fp16_exclude_markers": [
     "model.dec.",
     "dec_ret",
@@ -29,7 +30,7 @@
     "enc_ret_",
     "enc_conv_cache"
   ],
-  "n_fft": 256,
+  "n_fft": 1024,
   "n_mels": 23,
   "num_heads": 4,
   "real_output_dim": 10,