Preserve origins when desugaring augmented array assignments

^KT-63827: Fixed

analysis/low-level-api-fir/testData/getOrBuildFir/calls/arrayMinusAssignOperatorsInVariousScopes.kt

@@ -0,0 +1,12 @@
+class Foo {
+    companion object {
+        operator fun get(n: Int): Int = 42
+    }
+}
+
+private operator fun Any.set(i: Int, value: Int) {}
+
+fun usageFoo() {
+    <expr>Foo[1] -= 5</expr>
+}
+