Surround with try/catch should generate more Kotlin-style code (KT-5435)

#KT-5435 Fixed

idea/testData/codeInsight/surroundWith/tryCatch/moveDeclarationsOut.kt.after

@@ -1,9 +1,8 @@
 fun foo() {
     val a: String
-    val b: String
-    try {
+    val b = try {
         a = "aaa"
-        b = "aaa"
+        "aaa"
     } catch (e: <selection>Exception</selection>) {
     }
 

idea/testData/codeInsight/surroundWith/tryCatch/moveDeclarationsOutSingleStatement.kt

@@ -0,0 +1,5 @@
+fun foo() {
+    <selection>val a = "aaa"</selection>
+
+    a.charAt(1)
+}

idea/testData/codeInsight/surroundWith/tryCatch/moveDeclarationsOutSingleStatement.kt.after

@@ -0,0 +1,8 @@
+fun foo() {
+    val a = try {
+        "aaa"
+    } catch (e: <selection><caret>Exception</selection>) {
+    }
+
+    a.charAt(1)
+}