assorted: Correct freeleech config label

some sites doe not support searching for freeleech
so we Filter freeleech post search
I've amended the label to reflect the true process.

src/Jackett.Common/Definitions/amigosshare.yml

@@ -108,7 +108,7 @@ settings:
     default: "Set <b>Exibição De Torrents</b> to <b>Lista</b> in your <b>Minhas Configurações</b>.<br />Using <b>Capas</b> is not supported and will return 0 results."
   - name: freeleech
     type: checkbox
-    label: Search freeleech only
+    label: Filter freeleech only
     default: false
   - name: sort
     type: select

src/Jackett.Common/Definitions/bitturk.yml

@@ -71,7 +71,7 @@ settings:
     label: Password
   - name: freeleech
     type: checkbox
-    label: Search freeleech only
+    label: Filter freeleech only
     default: false
   - name: info
     type: info

src/Jackett.Common/Definitions/brasiltracker.yml

@@ -26,7 +26,7 @@ settings:
     label: Password
   - name: freeleech
     type: checkbox
-    label: Search freeleech only
+    label: Filter freeleech only
     default: false
   - name: sort
     type: select

src/Jackett.Common/Definitions/cartoonchaos.yml

@@ -17,7 +17,7 @@ settings:
     label: Password
   - name: freeleech
     type: checkbox
-    label: Search freeleech only
+    label: Filter freeleech only
     default: false
   - name: info_results
     type: info

src/Jackett.Common/Definitions/crnaberza.yml

@@ -63,7 +63,7 @@ settings:
     default: For best results, change the 'Torrents per page' setting to 100 on your 'Personal Options' from the 'Personal' menu on the Crna Berza webpage.
   - name: freeleech
     type: checkbox
-    label: Search freeleech only
+    label: Filter freeleech only
     default: false
   - name: sort
     type: select