espcoredump: fix idf_monitor test artifacts

tools/test_idf_monitor/tests/core1_out.txt

@@ -114,6 +114,12 @@ a15            0x0	0
   8    process 1073413520 0x400812c4 in ?? ()
 ERROR: GDB/MI command failed (error / msg="No symbol table is loaded.  Use the \"file\" command.")!
 
+==================== THREAD 1 (TCB: 0x3ffb5e80, name: '') =====================
+#0  0x400e37f7 in ?? ()
+#1  0x400d0c31 in ?? ()
+#2  0x40087018 in ?? ()
+ERROR: GDB/MI command failed (error / msg="No symbol table is loaded.  Use the \"file\" command.")!
+
 ==================== THREAD 2 (TCB: 0x3ffb6d48, name: '') =====================
 #0  0x40087010 in ?? ()
 ERROR: GDB/MI command failed (error / msg="No symbol table is loaded.  Use the \"file\" command.")!
@@ -155,6 +161,7 @@ ERROR: GDB/MI command failed (error / msg="No symbol table is loaded.  Use the \
 #2  0x40081a2b in ?? ()
 #3  0x40087018 in ?? ()
 
+
 ======================= ALL MEMORY REGIONS ========================
 Name   Address   Size   Attrs
 .data 0x400054 0x4 RW A