Revert "KT-8263: Conditional operators are not parsed correctly"

This reverts commit 85800b4f9f.

compiler/testData/diagnostics/tests/syntax/complicatedLTGT.fir.kt

@@ -0,0 +1,8 @@
+// SKIP_TXT
+// ISSUE: KT-8263
+
+fun test(x: Int, y: Int) {
+    if (<!CONDITION_TYPE_MISMATCH!>x < (<!SYNTAX!>if<!><!SYNTAX!><!> <!SYNTAX!>(<!><!UNRESOLVED_REFERENCE!><!SYNTAX!><!>y<!> ><!><!SYNTAX!><!> 115<!SYNTAX!>) 1 else 2))<!> {
+        Unit
+    }
+}

compiler/testData/diagnostics/tests/syntax/complicatedLTGT.kt

@@ -1,9 +1,8 @@
-// FIR_IDENTICAL
 // SKIP_TXT
 // ISSUE: KT-8263
 
 fun test(x: Int, y: Int) {
-    if (x < (if (y > 115) 1 else 2)) {
+    if (<!UNRESOLVED_REFERENCE!>x<!> < (<!SYNTAX!>if<!><!SYNTAX!><!> <!SYNTAX!>(<!><!UNRESOLVED_REFERENCE!><!SYNTAX!><!>y<!> ><!SYNTAX!><!> 115<!SYNTAX!>) 1 else 2))<!> {
         Unit
     }
 }