FIR: Don't use AnnotationUseSiteTarget.PROPERTY_GETTER when computing

deprecation from a callable reference use site.

Also fixed positioning of DEPRECATION(_ERROR) diagnostics on variable
assignments.

compiler/testData/diagnostics/tests/syntheticExtensions/javaProperties/Deprecated.fir.kt

@@ -7,12 +7,12 @@ fun foo(javaClass: JavaClass) {
     javaClass.<!DEPRECATION!>something2<!>++
 
     javaClass.something3
-    javaClass.something3 <!DEPRECATION!>=<!> 1
-    javaClass.something3<!DEPRECATION!>++<!>
+    javaClass.<!DEPRECATION!>something3<!> = 1
+    javaClass.<!DEPRECATION!>something3<!>++
 
     javaClass.<!DEPRECATION!>something4<!>
-    javaClass.something4 <!DEPRECATION!>=<!> 1
-    javaClass.<!DEPRECATION!>something4<!><!DEPRECATION!>++<!>
+    javaClass.<!DEPRECATION!>something4<!> = 1
+    javaClass.<!DEPRECATION, DEPRECATION!>something4<!>++
 
     javaClass.something5
     javaClass.something5 = 1
@@ -45,4 +45,4 @@ public class JavaClass {
      * @deprecated Ha-ha-ha
      */
     public void setSomething5(int value) { }
-}
+}