"Change to var": remove const modifier

#KT-35022 Fixed

idea/src/org/jetbrains/kotlin/idea/quickfix/ChangeVariableMutabilityFix.kt

@@ -56,6 +56,9 @@ class ChangeVariableMutabilityFix(
         if (deleteInitializer) {
             (element as? KtProperty)?.initializer = null
         }
+        if (makeVar) {
+            (element as? KtModifierListOwner)?.removeModifier(KtTokens.CONST_KEYWORD)
+        }
     }
 
     companion object {

idea/testData/quickfix/variables/changeMutability/const.kt

@@ -0,0 +1,8 @@
+// "Change to var" "true"
+object A {
+    const val A = 1
+
+    fun foo() {
+        <caret>A = 10
+    }
+}

idea/testData/quickfix/variables/changeMutability/const.kt.after

@@ -0,0 +1,8 @@
+// "Change to var" "true"
+object A {
+    var A = 1
+
+    fun foo() {
+        <caret>A = 10
+    }
+}

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixTestGenerated.java

@@ -14342,6 +14342,11 @@ public class QuickFixTestGenerated extends AbstractQuickFixTest {
                 runTest("idea/testData/quickfix/variables/changeMutability/capturedValInitialization.kt");
             }
 
+            @TestMetadata("const.kt")
+            public void testConst() throws Exception {
+                runTest("idea/testData/quickfix/variables/changeMutability/const.kt");
+            }
+
             @TestMetadata("funParameter.kt")
             public void testFunParameter() throws Exception {
                 runTest("idea/testData/quickfix/variables/changeMutability/funParameter.kt");