Fix linker script align 16 in floating address context (#2115)

Turns out we were just using the wrong var lmao

src/link/layout.cpp

@@ -126,7 +126,7 @@ void layout_AlignTo(uint32_t alignment, uint32_t alignOfs) {
 
 	if (isPcFloating) {
 		if (alignment >= 16) {
-			layout_SetAddr(floatingAlignOffset);
+			layout_SetAddr(alignOfs);
 		} else {
 			uint32_t alignSize = 1u << alignment;
 			uint32_t alignMask = alignSize - 1;

test/link/floating-align16-script.asm

@@ -0,0 +1,3 @@
+SECTION "test", ROM0
+	assert @ == $80 ; Set by the linker script.
+Label:: db 42 ; Make the section non-empty.

test/link/floating-align16-script.link

@@ -0,0 +1,4 @@
+ROM0
+	FLOATING
+	ALIGN 16, $80
+	"test"