boot_test: updates for changes to breakpoints

Because now they actually stop in the correct place.

Also, some other fixups because I'm too lazy to properly split patches
for a personal project.

gbdb_boot_test

@@ -32,7 +32,7 @@ runto 0xc
 assert $pc == 0xc
 assert $hl == 0x7fff
 
-step; step
+step
 assert $pc == 0xf
 assert $hl == 0xff26
 
@@ -59,7 +59,7 @@ assert $c == 0x12
 runto 0x27
 assert $pc == 0x27
 
-step; step
+step
 assert $pc == 0x28
 
 step
@@ -94,7 +94,7 @@ assert $pc == 0xa1
 
 runto 0xa3
 assert $pc == 0xa3
-step; step #FIXME: bugs
+step
 
 assert $pc == 0xa4
 
@@ -116,11 +116,11 @@ assert $pc == 0x96
 runto 0x34
 assert $pc == 0x34
 
-step; step
+step
 assert $pc == 0x37
 assert $de == 0xd8
 
-step;
+step
 assert $pc == 0x39
 assert $b == 0x08
 
@@ -128,7 +128,7 @@ runto 0x40
 assert $pc == 0x40
 assert $b == 0
 
-step; step
+step
 assert $pc == 0x42
 assert $a == 0x19
 
@@ -151,7 +151,7 @@ runto 0x55
 assert $a == 0
 
 assert $pc == 0x55
-step; step
+step
 assert $h == 0
 
 assert $pc == 0x56