Fix: Build save-common for JS target (#306)

### What's done:
* Enable JS conditionally in the kotlin-library.gradle.kts

Author: petertrr

buildSrc/src/main/kotlin/org/cqfn/save/buildutils/kotlin-library.gradle.kts

@@ -27,6 +27,11 @@ kotlin {
         }
     }
     val nativeTargets = listOf(linuxX64(), mingwX64(), macosX64())
+    if (project.name == "save-common") {
+        // additionally, save-common should be available for JS too
+        // fixme: shouldn't rely on hardcoded project name here
+        js(BOTH).browser()
+    }
 
     if (hasProperty("disableRedundantTargets") && (property("disableRedundantTargets") as String?) != "false") {
         // with this flag we exclude targets that are present on multiple OS to speed up build

save-common/build.gradle.kts

@@ -3,9 +3,6 @@ plugins {
 }
 
 kotlin {
-    // additionally, save-common should be available for JS too
-    js(BOTH).browser()
-
     sourceSets {
         val commonMain by getting {
             dependencies {