Replaced when appropriate 'TARGET_BACKEND: JVM' -> 'IGNORE_BACKEND: JS'. Enabled some succesfully working decompiledText tests.

idea/testData/decompiler/decompiledText/DependencyOnNestedClasses/directives.txt

@@ -1,4 +0,0 @@
-// TODO Remove this restriction when nested classes will be supported in js backend.
-// See KT-1907 Support nested classes in js-backend
-// https://youtrack.jetbrains.com/issue/KT-1907
-// TARGET_BACKEND: JVM

idea/testData/decompiler/decompiledText/InnerClasses/directives.txt

@@ -1,4 +0,0 @@
-// TODO Remove this restriction when nested classes will be supported in js backend.
-// See KT-1907 Support nested classes in js-backend
-// https://youtrack.jetbrains.com/issue/KT-1907
-// TARGET_BACKEND: JVM

idea/testData/decompiler/decompiledText/LocalClassAsTypeWithArgument/directives.txt

@@ -1,2 +1,2 @@
 // See KT-13691
-// TARGET_BACKEND: JVM
+// IGNORE_BACKEND: JS

idea/testData/decompiler/decompiledText/NestedClasses/directives.txt

@@ -1,4 +0,0 @@
-// TODO Remove this restriction when nested classes will be supported in js backend.
-// See KT-1907 Support nested classes in js-backend
-// https://youtrack.jetbrains.com/issue/KT-1907
-// TARGET_BACKEND: JVM

idea/testData/decompiler/decompiledText/SecondaryConstructors/directives.txt

@@ -1,4 +1,4 @@
 // TODO Remove this restriction when secondary constructors will be supported in js backend.
 // See KT-7798 JS: add support for secondary constructors
 // https://youtrack.jetbrains.com/issue/KT-7798
-// TARGET_BACKEND: JVM
+// IGNORE_BACKEND: JS

idea/testData/decompiler/decompiledText/TypeAliases/directives.txt

@@ -1 +0,0 @@
-// TARGET_BACKEND: JVM