FIR: simplify rendering of dispatch & extension receivers

idea/testData/fir/lazyResolve/elvis/main.txt

@@ -8,7 +8,7 @@ FILE: main.kt
             public get(): R|kotlin/String?|
 
         public final fun foo(): R|kotlin/String| {
-            ^foo when (lval <elvis>: R|kotlin/String?| = R|elvis/WithElvis.value|) {
+            ^foo when (lval <elvis>: R|kotlin/String?| = this@R|elvis/WithElvis|.R|elvis/WithElvis.value|) {
                 ==($subj$, Null(null)) ->  {
                     String()
                 }

idea/testData/fir/lazyResolve/elvis/results.txt

@@ -1 +1 @@
-D|this@R|elvis/WithElvis||.R|elvis/WithElvis.value|
+this@R|elvis/WithElvis|.R|elvis/WithElvis.value|

idea/testData/fir/lazyResolve/inInit/main.txt

@@ -8,7 +8,7 @@ FILE: main.kt
             public get(): R|kotlin/Int|
 
         init {
-            R|/Foo.x| = Int(42)
+            this@R|/Foo|.R|/Foo.x| = Int(42)
         }
 
     }

idea/testData/fir/lazyResolve/inInit/results.txt

@@ -1 +1 @@
-D|this@R|/Foo||.R|/Foo.x| = Int(42)
+this@R|/Foo|.R|/Foo.x| = Int(42)

idea/testData/fir/lazyResolve/inSecondary/main.txt

@@ -5,7 +5,7 @@ FILE: main.kt
 
         public constructor(): R|Foo| {
             super<R|kotlin/Any|>()
-            R|/Foo.x| = Int(42)
+            this@R|/Foo|.R|/Foo.x| = Int(42)
         }
 
     }

idea/testData/fir/lazyResolve/inSecondary/results.txt

@@ -1 +1 @@
-D|this@R|/Foo||.R|/Foo.x| = Int(42)
+this@R|/Foo|.R|/Foo.x| = Int(42)

idea/testData/fir/lazyResolve/simple/main.txt

@@ -8,5 +8,5 @@ FILE: main.kt
         lval y: <implicit> = Double(2.0)
     }
     public final fun bar(x: R|kotlin/Int|, y: R|kotlin/Int|): R|kotlin/Int| {
-        ^bar D|R|<local>/x||.R|kotlin/Int.plus|(R|<local>/y|)
+        ^bar R|<local>/x|.R|kotlin/Int.plus|(R|<local>/y|)
     }