Fix for 26 bit pre filter exit

PRM 3-305 says to return with MOVS PC,LR but in the 26 bit case we were not preserving flags.

s/PreFilter

@@ -43,7 +43,11 @@ pre_filter_handler
         LDR     r1,pre_filters
 pre_filter_exit
         CMP     r1,#0
+      [ No26bitCode
         Pull    "r1-r2,PC",EQ          ; End of list.
+      |
+        Pull    "r1-r2,PC",EQ,^        ; End of list.
+      ]
         LDR     r14,[r1,#next_ptr]
         Push    "r14"