Minor: trim in RenderIrElementVisitor

compiler/testData/ir/irText/expressions/sam/samOperators.fir.txt

@@ -1,5 +1,5 @@
 FILE fqName:<root> fileName:/samOperators.kt
-  FUN name:f visibility:public modality:FINAL <> () returnType:kotlin.Unit 
+  FUN name:f visibility:public modality:FINAL <> () returnType:kotlin.Unit
     BLOCK_BODY
   FUN name:test1 visibility:public modality:FINAL <> ($receiver:<root>.J) returnType:kotlin.Unit
     $receiver: VALUE_PARAMETER name:<this> type:<root>.J
@@ -28,4 +28,3 @@ FILE fqName:<root> fileName:/samOperators.kt
     BLOCK_BODY
       ERROR_CALL 'Unresolved reference: this#' type=IrErrorType
       ERROR_CALL 'Unresolved reference: this#' type=IrErrorType
-