Minor: don't trim file content in KotlinTestUtils#doLoadFile

compiler/testData/resolvedCalls/objectsAndClassObjects/classObject.kt

@@ -7,5 +7,3 @@ class Foo {
 fun test() {
     Foo.<caret>baz
 }
-
-

compiler/testData/resolvedCalls/objectsAndClassObjects/classObject.txt

@@ -9,6 +9,7 @@ fun test() {
 }
 
 
+
 Resolved call:
 
 Resulting descriptor: val baz: Foo defined in Foo.Companion

compiler/testData/resolvedCalls/objectsAndClassObjects/object.kt

@@ -5,5 +5,3 @@ object Foo {
 fun test() {
     Foo.<caret>baz
 }
-
-

compiler/testData/resolvedCalls/objectsAndClassObjects/object.txt

@@ -7,6 +7,7 @@ fun test() {
 }
 
 
+
 Resolved call:
 
 Resulting descriptor: val baz: Int defined in Foo