Do not expect END in load file

Also remove EQU from grammar until it is properly implemented.

Author: ian-h-chamberlain

src/parser/grammar/redcode.pest

@@ -21,7 +21,7 @@ Field = !{ AddressMode? ~ Expr }
 Opcode = {
     ^"DAT" | ^"MOV" | ^"ADD" | ^"SUB" | ^"MUL" | ^"DIV" | ^"MOD" |
     ^"JMP" | ^"JMZ" | ^"JMN" | ^"DJN" | ^"CMP" | ^"SEQ" | ^"SNE" |
-    ^"SLT" | ^"SPL" | ^"NOP" | ^"ORG" | ^"EQU"
+    ^"SLT" | ^"SPL" | ^"NOP" | ^"ORG"
 }
 
 Modifier = { ^"AB" | ^"BA" | ^"A" | ^"B" | ^"F" | ^"X" | ^"I" }

tests/data/dwarf_loadfile.red

@@ -9,5 +9,4 @@ ORG    1
 DAT.F  #0, #0
 ADD.AB #4, $-1
 MOV.AB #0, @-2
-JMP.A  $-2, #0
-END
+JMP.A  $-2, #0