FIR CFG: remove duplicating lambda enter -> exit connection

compiler/fir/analysis-tests/testData/resolve/cfg/flowFromInplaceLambda.dot

@@ -310,14 +310,14 @@ digraph flowFromInplaceLambda_kt {
         106 [label="Exit function test_4" style="filled" fillcolor=red];
     }
     105 -> {107};
-    107 -> {108 108} [color=green];
+    107 -> {108} [color=green];
     107 -> {126} [color=red];
     108 -> {109};
     109 -> {110};
     110 -> {111};
     111 -> {112};
     112 -> {113};
-    113 -> {114 114} [color=green];
+    113 -> {114} [color=green];
     113 -> {132} [color=red];
     114 -> {115};
     115 -> {116};
@@ -419,7 +419,7 @@ digraph flowFromInplaceLambda_kt {
         159 [label="Exit function test_6" style="filled" fillcolor=red];
     }
     158 -> {160};
-    160 -> {161 161} [color=green];
+    160 -> {161} [color=green];
     160 -> {165} [color=red];
     161 -> {162};
     162 -> {163};

compiler/fir/analysis-tests/testData/resolve/cfg/lambdaAsReturnOfLambda.dot

@@ -39,7 +39,7 @@ digraph lambdaAsReturnOfLambda_kt {
         11 [label="Exit property" style="filled" fillcolor=red];
     }
     10 -> {12};
-    12 -> {13 13} [color=green];
+    12 -> {13} [color=green];
     12 -> {0} [color=red];
     13 -> {14};
     14 -> {15};

compiler/fir/analysis-tests/testData/resolve/cfg/lambdaReturningObject.dot

@@ -72,7 +72,7 @@ digraph lambdaReturningObject_kt {
         18 [label="Exit function foo" style="filled" fillcolor=red];
     }
     17 -> {19};
-    19 -> {20 20} [color=green];
+    19 -> {20} [color=green];
     19 -> {23} [color=red];
     20 -> {21};
     21 -> {22};

compiler/fir/analysis-tests/testData/resolve/cfg/postponedLambdaInConstructor.dot

@@ -54,7 +54,7 @@ digraph postponedLambdaInConstructor_kt {
     13 -> {15};
     14 -> {9} [color=green];
     14 -> {12} [color=red];
-    15 -> {16 16} [color=green];
+    15 -> {16} [color=green];
     15 -> {17} [color=red];
     16 -> {14};
     17 -> {19};