Fix "+" appearing on ConfigurableSources in Browse > Extensions (#434)

* align text towards right end

aligns the text (`Settings/Settings+` etc) to the end of the Text rather
than letting it be centred

* append "+" only for two states

"+" needs to be added only if the following conditions are met:
 - Extension is Installed and is a ConfigurableSource (regardless of it
   having an Update or not)
 - Extension is in InstallStep.Idle state

* linting

* Revert "align text towards right end"

This reverts commit 5e4511d0beaff038e9dc31189095e1b6d853c020.
Since it was rejected and doesn't help much

* better if checking strategy

because installStep.idle holds true for all extensions, even uninstalled
ones, that leads to not having to check Ext.installed anyways for the
combined OR to return `false`
Checking for extension.Installed check first leads to getting `false`
faster

app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionHolder.kt

@@ -98,7 +98,10 @@ class ExtensionHolder(view: View, val adapter: ExtensionAdapter) :
             }
         )
         // SY -->
-        if (extension is Extension.Installed && extension.sources.any { it is ConfigurableSource }) {
+        if (extension is Extension.Installed &&
+            installStep == InstallStep.Idle &&
+            extension.sources.any { it is ConfigurableSource }
+        ) {
             @SuppressLint("SetTextI18n")
             text = "$text+"
         }