Honor alignment offset for ALIGN[16, N]

The *one* place where it was missed...

src/asm/section.cpp

@@ -355,7 +355,7 @@ static struct Section *getSection(char const *name, enum SectionType type, uint3
 		} else if (alignment == 16) {
 			// Treat an alignment of 16 as being fixed at address 0
 			alignment = 0;
-			org = 0;
+			org = alignOffset;
 			// The address is known to be valid, since the alignment is
 		}
 	}

test/link/align16.asm

@@ -0,0 +1,3 @@
+SECTION "test", ROM0, ALIGN[16, 3]
+	align 16, 3
+	db 1, 2, 3

test/link/align16.link

@@ -0,0 +1,4 @@
+ROM0
+		org 3
+		align 16,3
+		"test"