[FIR] Fix creating DefinitelyNotNullTypes

Also fix substitutions to them

compiler/testData/diagnostics/tests/generics/nullability/expressionsBoundsViolation.fir.kt

@@ -7,10 +7,10 @@ fun <E : CharSequence> foo1(x: E) {}
 fun <E : CharSequence> E.foo2() {}
 
 fun <F : String?> bar(x: F) {
-    <!INAPPLICABLE_CANDIDATE!>A<!>(x)
+    A(x)
     <!INAPPLICABLE_CANDIDATE!>A<!><F>(x)
 
-    <!INAPPLICABLE_CANDIDATE!>foo1<!>(x)
+    foo1(x)
     <!INAPPLICABLE_CANDIDATE!>foo1<!><F>(x)
 
     x.<!INAPPLICABLE_CANDIDATE!>foo2<!>()

compiler/testData/diagnostics/tests/generics/nullability/smartCastsValueArgument.fir.kt

@@ -45,7 +45,7 @@ fun <T : CharSequence?> foo(x: T) {
         bar2(x)
         <!INAPPLICABLE_CANDIDATE!>bar3<!>(x)
 
-        <!INAPPLICABLE_CANDIDATE!>bar1<!>(y)
+        bar1(y)
         bar2(y)
         <!INAPPLICABLE_CANDIDATE!>bar3<!>(y)
     }

compiler/testData/diagnostics/tests/generics/nullability/tpBoundsViolation.fir.kt

@@ -38,7 +38,7 @@ class A<F> {
         x4.checkType { _<Z>() }
 
         <!INAPPLICABLE_CANDIDATE!>foo1<!><W>(w)
-        <!INAPPLICABLE_CANDIDATE!>foo1<!>(w)
+        foo1(w)
         foo2<W>(w)
 
         val x6 = foo2(w)

compiler/testData/diagnostics/tests/generics/nullability/useAsValueArgument.fir.kt

@@ -13,6 +13,6 @@ fun <T : String?> foo(x: T) {
     bar1(x)
     bar2(x)
 
-    <!INAPPLICABLE_CANDIDATE!>bar3<!>(x)
+    bar3(x)
     bar4(x)
 }