fix: incorrect order-of-operations in ARM BL impl

src/cpu/arm/branch.zig

@@ -10,7 +10,7 @@ pub fn branch(comptime L: bool) InstrFn {
     return struct {
         fn inner(cpu: *Arm7tdmi, _: *Bus, opcode: u32) void {
             if (L) cpu.r[14] = cpu.r[15];
-            cpu.r[15] = cpu.fakePC() +% sext(24, opcode << 2);
+            cpu.r[15] = cpu.fakePC() +% (sext(24, opcode) << 2);
         }
     }.inner;
 }