IfThenToSafeAccessInspection: fix it works correctly for variable/operator call

#KT-30513 Fixed
#KT-17071 Fixed

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/callInvokeOperator.kt

@@ -0,0 +1,8 @@
+// HIGHLIGHT: INFORMATION
+fun test(foo: Foo?) {
+    <caret>if (foo != null) foo()
+}
+
+class Foo {
+    operator fun invoke() {}
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/callInvokeOperator.kt.after

@@ -0,0 +1,8 @@
+// HIGHLIGHT: INFORMATION
+fun test(foo: Foo?) {
+    foo?.invoke()
+}
+
+class Foo {
+    operator fun invoke() {}
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/callInvokeOperator2.kt

@@ -0,0 +1,11 @@
+class Foo(val bar: Bar)
+
+class Bar {
+    operator fun invoke() {}
+}
+
+fun test(foo: Foo?) {
+    <caret>if (foo != null) {
+        foo.bar()
+    }
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/callInvokeOperator2.kt.after

@@ -0,0 +1,9 @@
+class Foo(val bar: Bar)
+
+class Bar {
+    operator fun invoke() {}
+}
+
+fun test(foo: Foo?) {
+    foo?.bar?.invoke()
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/callVariable.kt

@@ -0,0 +1,4 @@
+// HIGHLIGHT: INFORMATION
+fun test(foo: (() -> Unit)?) {
+    <caret>if (foo != null) foo()
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/callVariable.kt.after

@@ -0,0 +1,4 @@
+// HIGHLIGHT: INFORMATION
+fun test(foo: (() -> Unit)?) {
+    foo?.invoke()
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/callVariable2.kt

@@ -0,0 +1,7 @@
+class Foo(val f: () -> Unit)
+
+fun test(foo: Foo?) {
+    <caret>if (foo != null) {
+        foo.f()
+    }
+}

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/callVariable2.kt.after

@@ -0,0 +1,5 @@
+class Foo(val f: () -> Unit)
+
+fun test(foo: Foo?) {
+    foo?.f?.invoke()
+}