trainer tower: finish code decomp

ld_script.txt

@@ -267,7 +267,6 @@ SECTIONS {
         asm/ss_anne.o(.text);
         asm/cereader_tool.o(.text);
         src/trainer_tower.o(.text);
-        asm/trainer_tower.o(.text);
         asm/unk_815EDDC.o(.text);
         asm/unk_815F138.o(.text);
         asm/berry_fix_program.o(.text);