Replace deprecated lambda syntax in testData

It's done with similar constructions where possible trying to preserve
intended behavior.
Some usages are removed because they test exactly the feature that
we are going to drop soon.

idea/testData/resolve/partialBodyResolve/Lambda.dump

@@ -5,6 +5,6 @@ class C {
 }
 
 fun foo() {
-    val lambda = {() -> /* STATEMENT DELETED: x() */; C() }
+    val lambda = { -> /* STATEMENT DELETED: x() */; C() }
     lambda().<caret>f()
 }

idea/testData/resolve/partialBodyResolve/Lambda.kt

@@ -3,6 +3,6 @@ class C {
 }
 
 fun foo() {
-    val lambda = {() -> x(); C() }
+    val lambda = { -> x(); C() }
     lambda().<caret>f()
 }